I'm finding myself to be a huge fan of Wiki's lately. In fact, I think my next project will be porting WikkiTikkiTavi, a nice PHP Wiki, to use PostgreSQL.
Is it wrong to want to set up a PersonalWiki, as well as Wiki's for two (maybe three!) separate projects you are working on? Oh, and I can think of a topic or two that could benefit from a Wiki, as well. ;-)