Kindle and Memory

I bought a Kindle a few weeks ago. This year I'll be travelling four times on business and three on pleasure, and it'll be nice to have the Kindle for reading. I enjoy a lot of things about it - it's a comfortable size and weight; if you turn off the wireless, the battery lasts for days; it holds a lot of books; the non-backlit screen means no eyestrain (though you can't read in the dark); you can adjust the size of the font; the books are cheap (many are even free, including lots of classics and out of copyright works).

But the absolute best thing about it?

"Our records show you have already purchased [TITLE]..."

I got that this morning when I inadvertently double clicked the Buy Now button on Emma Grossman's translation of Don Quixote, which I've been meaning to buy for a while. But I also got it when I forgot I'd already bought and downloaded Dick Francis' latest book...

As someone who finds many second (and even third!!!) copies lying around the place, I bless them for this feature - and only wish other online bookstores would implement it. Sure, for non-Kindle purchases I would like the option to go ahead and buy more (sometimes you lose one, sometimes they're presents), but it would be nice to have a check on my memory of what's already in the entirely too large pile To Be Read...