I've just got my hands on a GP2X Wiz:

It's primarily for gaming, but I did get an office-type suite for it too (just to pretend to be a serious grown-up person) and I've just installed a reader that claims to handle PDFs as well as text. Haven't tried that one out yet.
The Wiz is about the size of the bottom half of a Nintendo DS. It's a proper computer running a version of Linux, so its real strength is being able to emulate pretty much anything pre-2000. Currently awaiting a delivery of SD cards so I can start emulating! I'm still an Amigaphile at heart, and it will be great to have a pocket Amiga. Meanwhile I'm messing about with some Wiz-specific games and also testing out a load of Flash games. It's a bit erratic with Flash programs -- some it runs perfectly, some not at all, and most somewhere in between.
The only slightly irksome thing is that, although the Wiz only came out last year, the company has already moved on to its successor (the Caanoo). Oh well.