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Well, my Nook (with overdrive installed) does sort of work that way, though-- I can check out ANY available book from my state's digital collection anywhere that I have WiFi.

Huh--really? I can't do that on mine! (I also have a Nook with Overdrive.) At least, I don't think so. Just the ones fromk my local library system, and the books I want are often out. And the damn books are always dematerializing on me when they get due. Yes, even in airplane mode. There's nothing worse than having your book vanish before your eyes. (Okay, yes, there is. First-world problem.)