I am curious about the touchscreen. I bought a Kindle last month, and still sometimes find myself jabbing its screen instead of pushing the buttons on the side.
Being able to lend a virtual book to your friend for 14 days is pretty cool. I would lend and borrow books more frequently, if there wasn't the concern about forgetting to return them. One of my friends actually keeps a library system for her books, with a card she sticks into the book cover.
The B&N advertising claims "over a million titles" whereas Amazon says 350,000. I wonder how B&N can have more titles. Perhaps through the Google Books project?
I've really enjoyed having a Kindle. I carry it in my purse. It is convenient to have a dozen books on hand to read, depending on my mood.
Another unforeseen benefit has been the ability to highlight sections and add notes, and have those saved into a single file.