DId you see what Arlosmom did? Very creative. I"ve link the thread with her kitchen below on the link. Also Here's a URL with threads I found just doing a search.
http://ths.gardenweb.com/search/nph-ind.cgi?term=blind+corner&forum=kitchbath&forum_name=Kitchens

Here is a link that might be useful: Creative blind corner solution

Just some technicalities for this soon to be snowy morning.

When you have a corner like that, no matter what you put there, both sides need to have some filler space - a minimum of 1.5" per side. The filler is to allow for door swings and handles so the opposing unit don't run into each other.

You might have already allowed for this or might not, but the 21" cabinet would become an 18" cabinet and with a 27" opening for the blind corner cabinet, it would be fine, the "filler" is usually built-in to the cabinet and adjustable. You would have a 24" opening.

If you decide on the blind corner, consider half moon shelves all the way up for your cookware. I don't know your decorating tastes, but maybe a "shield wall" behind the door or as backsplash - some ikea gruntal rails and line up your lids behind the bar.

If you decide to have a drawer unit instead, remember that you must still have that filler on both sides - still an 18" cabinet and a 24" drawer cabinet.

My blind corner, as it's designed, is a great solution for pretty limited applications. I only store stuff that I need infrequently on the sliders. The main cavity of the cabinet is great for tall or bulky items (like Costco's jumbo pack of toilet paper, 50 lbs. of dog food or the enormous crab pot). But I definitely don't have it configured for heavy every day use.

If I were using my blind corner for pots and pans like remodelfla suggested, I'd make a few changes. First, I'd hinge the door on the other side so that it swung 180 degrees out of the way, and I'd install a rack for holding lids or foils and wraps or something useful (but lightweight) on the door. On the inside of the cabinet, I'd put hooks or pegboard with hooks on the side wall opposite the sliders to hang skillets or smaller pans that could remain in place when the sliders pull out. I'd probably look into a short rolling pullout mechanism to install on the floor of the main cabinet to pull out of the way for the sliders (you'd just need to make sure it pulls out far enough and that the lower slider would clear the tracks of the pullout).

I think there are probably a lot of creative ways to improve what I have for more active storage. You'd just have to plan carefully to make sure everything you add clears each other in open and shut positions. I'm a huge fan of the Container Store and they have lots of creative options that you could combine.

Here is a link that might be useful:

I've been fantasizing about something I'll call "The Batman Corner Solution." It would involve having drawers on either side of the corner. The dead space would be accessible by foot-tap and would rise up out of the base cabinets. Of course, it would do so in segments, since there's only going to be 18" of head room there. So the counterop would lift up to, say, 16", and then the first shelf would come up. You'd have to move that shelf out of the way to get to the shelf below, so perhaps that last bit of storage is only for things you'd use once a year, LOL.

I would go ahead and market this now, but I haven't yet solved the problem of the seams you'd need in the countertop. They'd get pretty crumby, and wouldn't look very good. Darn.

Bmorepanic, thanks for the min. corner clearance number. I wasn't sure what was needed as we design our blind corner.

I'm seriously thinking about using Arlosmom's solution, but before that, the leading candidate for our problem corner was the Lee Valley corner. It had some good recommendations (maybe at ikeafans? Sorry...I don't remember exactly...), and looked useful.

Here is a link that might be useful: Lee Valley corner

Thanks all---yep, we have filler factored in, so the door would be 18" on the sink side or 21" on the pots side. It's actually the primary reason we're looking at face frame cabinets, because we need so much filler in that corner and we also need 3" of filler to the left of the sink to center it, so it seemed wiser to just do face frame and build it all into the frames evenly.

I love Arlosmom's solution, but had thought it probably wouldn't work super well in a corner where we would be storing a lot of heavier things that got daily use. I'll have to think through all of the modification suggestions to see if that might work---thanks!

And karen_belle, love the Batman solution! I could totally see that working as a way to hide an appliance or something....we once looked at a house that had a classic 1960s kitchen, and if you pushed a button the toaster fell out of the wall for you to use. You could hide a microwave down there somehow with a little ingenuity! :)