You'll have to post how you like the DX. It was about to be released when I bought my Kindle2, but I thought it might be a little big. I guess the screen orients itself to whatever position you have it in.
I carry mine everywhere, and can read a quick page or two in a few moments (it always goes right to where you left off), and can even read it in the car (if I try to read books in the car I get carsick).
I noticed they've even got a bike repair manual available on the kindle! There's lots of kindle-specific bags available, but I got a cheaper cover for it for protection, and carry it in a cheap nylon purse with all my other junk. For a book light I got a cheap clip on gooseneck LED light, but didn't like it clipped to kindle cover, so I just laid it on my chest and read that way. I get about a week of reading before I have to recharge the batteries.
vickie