I don't think there are any rules. I've seen a lot of folks put glass on the two cabinets on either side of the window over the sink. You can use a glass cabinet as a focal point on its own. I put glass on one cabinet on the end of a run of cabinets, and also on a hutch. Usually you would use that cabinet to display nicer dinnerware, pottery, etc...
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Sorry, but I couldn't bother getting into Photobucket to post 2 photos in one post...

Here is the other side of the kitchen

Yes, no rules, just whatever you think will look nice.

We did glass at the edges up our range run to break of what could have been a heavy run of uppers centered by a large wood hood, and at the breakfast bar to lighten up the top-heavy look.

They should make some sense. GF put one on each end of the run of cabinets. Or flanking the sink, or cooktop. But as long as they make sense to you, it should work. Just think about contents as well....GF planned to store her China in one and the other was for display.

We have glass front uppers above our regular cabinets and use those only for display and they are lit. We also made those doors separate from the door below so they wouldn't be opened and closed all the time.

All beautiful examples of glass front cabinets. Another thing to think about is if you want to have your items on display? There are also opaque glass fronts that will give you the variation, but you cannot see through them.

Off topic: Marcy can you please tell me the details of your kitchen. Color of cabinets, backsplash and granite. I have a second home in Florida that will have to be renovated and I am "collecting" ideas for this future renovation.
Thanks.

I have white cabinets with glass doors. They are clear glass with divides. My only comment is that we have clear glasses stored there and it looks bland. I don't have a lot of space so using a cabinet for display items is not an option. Just something to consider.

I agree it helps if there is some sort of logic or symmetry. We have a smaller kitchen and I could not decide where to have glass - no matter how I did it, the glass seemed too random. So I went all glass (food items go in the pantry and kids plastic stuff etc.. in drawers) and I've loved it.

I went pretty much all glass, too. I have never been a big fan of uppers-- they usually have too heavy a look for me. So the glass was a compromise. I'm very happy with them.

I have a U shaped kitchen, and I like the idea of putting all upper glass cabinets flanking the window and the sink below it. That side of the house has a lot of windows, and it feels right that you'd want to put glass cabinets alongside all those windows.

But, two more questions:

1) I thought the purpose of bringing in glass cabinets was to break up the monotony of this block of all white cabinetry.

But, if I put glass cabinets on only 1 wall where there's already a window, am I really accomplishing that? It seems like the window itself would have broken up that block of white cabinetry.

2) I couldn't find glass cabinets that matched the cabinets I was planning on using. So, if I used glass cabinets, it'd have to be slightly different from all the cabinets- one cabinet style would be raised panel and other cabinet style would be shaker.

With all the upper glass cabinets on 1 wall would be 1 style,
would that seem 'off' even though they wouldn't be next to an upper cabinet of another style?

I'm curious to know that answer as well, I have the same issue with different style cabinet doors