I've had a few days now to play with my Kindle and I give it a big thumbs up.
I've been downloading mainly Game Design books:
But a couple of fiction novels as well:
One feature that I didn't know about is the web browser it has in the Experimental section. It's doesn't run at blazing speed, but I'm able to read the mobile versions of websites like ESPN. Unless i'm missing some way that they are going to charge me for this, it is completely FREE internet access.
My favorite feature is that it tracks the location of your reading across devices. So, i'll be able to read on my iPhone at work and then pick right back up on my Kindle when I get home.
The ability to subscribe to a blog and have it auto update throughout the day is great. It gives the full blog view instead of a limited RSS view.
I also ordered the leather cover once I decided that a flip open case is the type that will feel best to me.