What I'd really like for the Z is something like the Gnome "tomboy" package (
http://www.beatniksoftware.com/tomboy/), which is basically just a really handy package that lets you make "notes"--but which has the added advantage of easy hyperlinking between notes (so you could, say, make a note listing scientific document processing software like LaTeX, LyX, etc, then highlight "LaTeX" and press a button to make a new card linked to the old card, titled "LaTeX" and ready for more notes).
I suppose it's much like a wiki sort of thing, but since it's not web-based, it's just a bit more intuitive. I'd be interested in wiki-ish solutions too, I suppose, but there's an ease-of-use barrier that's there.
Anything like that out there in Zaurus-Land? I suspect that you could even install Tomboy on GPE, but since I'm running a 6k and OZ 3.5.2 (Opie) there's just trouble involved with 3.5.2 GPE and a 6k...
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