I may be behind the curve, but I'm currently reading a book on my Handspring for the first timeCory Doctorow's Down and Out in the Magic Kingdom. (What I mean is, this is the first time I'm reading a book on my Handspring, not the first time I've read Cory's novel.) I find the experience delightful, and I don't know why I haven't tried it sooner.
The next eBook on my list is The Hacker Crackdown by Bruce Sterling, which, if you didn't know it, you can download for free from the Palm Free eBooks site.

