I'm a big fan of the Wiki, we use an asp implementation internally (FlexWiki) for dev discussions, and have recently have been checking out TiddlyWiki. This thing is an astounding feat of engineering. A self-modifiable wiki contained entirely in a single html page, with no server-side requirements. Check it out.
Also, via John Ludwig's blog (ex-Microsoft, now at Ignition Partners) I find mention of GTDTiddlyWiki, a TiddlyWiki customized for Dave Allen's Getting Things Done system. Maybe Scoble should check it out as he's trying to get back on the GTD waggon.
Recommended. Content on the micro scale.