Wikidpad is Wiki-like note-taking software, eventhough it is very portable to start out I made it more portable. Wikidpad is opensource software, so enjoy!
Link: http://cubegames.net/downloads/Wikidpad%20Portable.paf.exe
By the way , Wikidpad Portable currently for some reason is incompatible with the PortableApps Menu, but can be used by double-clicking on the Wikidpad Portable icon.
[Moderator RM: Fixed your link for you]