I dont know if I've mentioned before that I have a Sharp Zaurus 5500 Personal Mobile tool or not but I do and it's quite handy.
I've found a number of programs I love:
Opie Reader (With the addition of Plucker)
I'm currently searching for a PIM that I like, I tried using MiniRubyWiki Which worked but it required a lot of upkeep in starting and stopping it every time I changed my network settings so it would have the new IP.
I'm using TKCRom so I no longer have the Sharp PIM apps built in, but I didnt like them anyway.