Infogami
I've just noticed Aaron Swartz's new startup/project infogami. It's a wiki and blogging tool that offers all of the things I couldn't get from Backpack, JotSpot, or PBWiki, namely:
- Markdown for markup
- No page limits
- Easy access controls that let you make publicly-editable pages
I made a wiki with some stuff ported over from my private wiki.