I've been thinking about buying a PDA for a while, but the price tag really put me off the idea in a lot of ways. It was ugly, thinking about it for me, especially since so little of that level of tech exists in the schools. So, after thinking about organization stuff, and reading the Thomas Simonicelli (sp?) book on organization for System Administrators put out by O'Reilly, I thought I'd try the PAA described by Tom and also described at http://www.43folders.com/ , as well.
Mine consists of a couple dozen index cards — some colors, but mostly white, each with a hole punched in the same place, and linked by a loose-leaf binder ring. I also have a blue binder clip at the other end to hold it all together. One page has a make-shift calendar on it; another has my school's period times, others have an attendance sheet for my spring sport, a list of plants I've pointed out to them, and stamps from letterboxes we've found. It's a useful place to jot down demerit and merit points, and I can pull a sheet out to give a kid a pass to the library.
It turns out that there's a simple wiki-scripted HTML page (which you can find at http://shared.snapgrid.com/gtd_tiddlywi