A bit of googling, I went from "pocket wiki" to "personal wiki" and landed me with this TiddlyWiki. I can't believe it, the entire app is in one html page, and is only 200kbs. Truly a work of art.
Tonight I'm going to look for a sync program to update blog / hosted wikis. I'm probably going to have to find my USB stick as well so that I can carry this with me anywhere.
I wonder if this can be run off a smartphone. Then I can carry my personal wiki with me on my mobile phone. That'd be something.