My boss has one. He loves it. He tells me it's a pleasure to wake-up and have the newspaper loaded onto it every morning. What I see here is not so much an easy way to carry lots of books around, it's a way to sync your reading life with your automated life.
I have one, and I love it as well. I have a hard time committing to read long things on my computer -- I now just put it on my kindle, and when I'm away from my computer, I can focus and really read the articles.
Do you find that the screen makes a huge difference, or would an iPod touch-like device with a color display be just as good with the right software?
Is it easy to write notes on it have those synced to your computer?
My girlfriend bought one when the price fell also. She adores it. It's been practically glued to her hand for the past few weeks.