Personal wiki

I started using a personal wiki for a while now. It helps me to take class notes and other adhoc to-do lists and stuff. Itz quite useful coz I have hyperlink references in my class notes. The one I use is pmwiki (itz free) and itz configuration on mac didnt take much time. I had earlier setup mediawiki for official purposes and the difference I see in personal wiki is that there is no DB configuration that needs to be done. Itz definitely more simple and easy to setup a personal wiki. I heard that people carry some personal wiki applications in their flash drives and making it more accesible it for them. Google, in their Android platform had released a wiki application as a demo app. Personal wikis seems to be getting into many arenas.