The Kindle Fire runs a modified version of the Android O/S which is based on Linux. While viruses do exist, they are still relatively uncommon. There is anti-virus software for Android but I don't know if it would run on a Kindle. Frankly, I wouldn't spend a lot of time worrying about it. There have been a few instances of infected apps making there way into the Android Marketplace, which is policed nowhere nearly as carefully has Apple's App Store. While I haven't researched those specific apps, I wouldn't surprise me if they were the kind of apps someone might download if they were looking to circumvent "the system" (perhaps I should say getting something for free that they should have been playing for). I also don't know if the Kindle Fire has access to the Android Marketplace or just the Amazon Marketplace. Based on the previous post it appears there is a way to "sideload" apps on a Kindle. Sideloading is a term that refers to installing an application that doesn't come from an "approved" source. This doesn't mean the application is "bad" just not where the vendor wants you to get it from. For for example, I have an Android phone and the "official" source of apps is the Android Marketplace. As it turns out, Amazon gives away a free app every day. I can download, for example, a perfectly legitimate (and free) version of Angry Birds. To get it onto my phone, I have to "sideload" it. The software you mention are all for Windows based machines and would not run on Android. Any updates will come from Amazon and likely be pushed to the device.

yes you sure can sync all three as long as they all are on the same kindle store account name. Have you tried going to your iphone kindle app and clicking on the sync function there on it and seeing if you can get it to sync and add the new books? I do not have the iphone but that is how it worked for my laptop, I had to go to the kindle app on it and click there to sync and find new items, then go to the archive area on that kindle app and double click on each to get it downloaded to there. I know it says it can be synced with the iphone and my nephew has both and did it so if you play around with it you should be able to do it. Try going to the Menu on your kindle pc, then the manage my account to see if you can click from there on each individual listed book in the drop down beside them and select your iphone app there. I am able to do my sync that way also. "For Whispernet synchronization to work, however, you must keep it turned on in your account settings on the Amazon site (it's on by default)--and, of course, you must turn on the wireless support on your Kindle devices. The option of turning sync on or off is useful, because if more than one person is reading a book registered to a single account at the same time, they probably don't want to use one another's bookmarks. But if you're the only account user, turning sync on lets you pick up reading on any Kindle device or application. "

Tami, I downloaded it free from the Amazon site. Of course the books I am most interested in are textbooks so they are just expensive as the printed books. So if I buy a textbook Kindle version and have the Kindle PC app downloaded at home and work, I will be able to access the textbook both places! That would be a true back saver!!!! Textbooks are heave and never seem to be in the office where I need them- 45 miles between house and work is not conducive to running to the other for a book.

Fran1523 -- Nook owners can lend each book only ONCE, for a period of 14 days. And if you "make the offer to lend" a book but the recipient doesn't accept it within 7 days, or rejects it altogether, you cannot lend it to anyone else. You cannot retract an offer to lend once the offer has been made. The lending feature will be available to Kindle owners very soon, so it is no longer an "advantage" for the Nook. Taigen -- The following is from the Amazon web site: "We are excited to now ship Kindle to Canada. Customers in Canada will enjoy: Books in Under 60 Seconds: Think of a book and you could be reading it in under a minute. Free Wireless: Free 3G wireless lets you download books right from your Kindle. No monthly fees, service plans, or hunting for Wi-Fi hotspots. For non-U.S. customers, there are also no additional charges for wireless delivery in or outside your home country. See Coverage Map. See Wireless Terms and Conditions Growing Selection: Over 530,000 English-language books to choose from; plus U.S. and international newspapers and magazines are available for your country. Because publishers give us eBook rights on a country by country basis, available titles for your country will vary from our current U.S selection. We are actively working with publishers to get the rights to all titles for every country and adding this selection every day. Check the Kindle Store to see available titles. Low Book Prices: New York Times® Best Sellers and New Releases are $11.99, unless marked otherwise. You'll also find many books for less - over 135,000 titles are priced under $5.99" I don't think it's that any particular publishing house won't allow any of its books to be sold to Canada (or any country other than the USA), but it's more on a book-by-book basis. It's just a matter of time before all books available in the USA will be available in other countries. But, as it says on the Amazon web site, you can check the availability of books at any time, so if you're thinking of getting a Kindle, look to see if books you'd want are available. Nooks cannot be sold to anyone outside of the USA, so even with limited e-book availability, the Kindle is obviously the better choice. Nook owners keep mentioning the ability to get library books on their Nooks. I've searched for information on the Barnes and Noble web site, but cannot find anything about this. So, the only comment I can make is that if you have to go to the library to "borrow" the book onto your Nook, I don't see any advantage to that at all. It's so nice, with the Kindle, to be able to download books wherever you are at any time of the day or night. And I would imagine that you only get to have the library book for a specific period of time, and I don't like that at all. When you buy a Kindle book (or download a free Kindle book), it's yours forever. Even if you delete it from your Kindle, you can still download it again for free because it's in your Amazon Kindle account. Kindles in the USA have a one-year warranty. Kindles sold to folks in Canada have a one-year warranty. Canadians would have to send their Kindle to the USA for warranty service. I'm in California, and I'd have to send my Kindle elsewhere in the USA for warranty service, so we're even on that one. :-) Murray's Mom -- LOL! We have at least 800 physical books here in the house (hardbound and paperbacks; and, no, we haven't read all of them), but that didn't stop us from getting Kindles! We have the 2nd generation Kindles, so ours hold approximately 1,500 books each. The latest generation Kindles hold at approximately 3,500 books each. It's a heck of a lot easier to carry 100 books with you on a Kindle than it is to haul 100 physical books around with you! In fact, that's one of the driving reasons when I bought a Kindle for my husband. We both love to read, and when we go on vacation, we both always take books with us. But Hubs pretty much only buys hardbound books, and he tends to buy HUGE (thick) books. Try hauling four big, heavy, hardbound books in a carryon when you're flying somewhere. Ouch. Carrying a Kindle is a breeze. You can pretty much always have the Kindle with you, so you can read whenever you have a few minutes free - like waiting for a meeting to start, or while waiting for a bridge to "do its thing." We have two bridges in Sacramento - the Tower Bridge is a vertical lift bridge, and the I Street Bridge is a metal truss swing bridge. If you get stopped at the I Street Bridge as it begins "its thing," you're going to be there for at least 15 minutes. The Tower Bridge takes about 7-8 minutes. Many medical offices don't have magazines in waiting rooms now because of the risk/potential of passing germs, so if you have your Kindle with you, you get to read what you want to read while you're waiting. :-)