Matt Webb likes VoodooPad, the desktop wiki application from Gus Mueller, but he does not like his data to be bound up in a proprietary format. So he's cooked up a bundle for the powerful TextMate text editor that allows him to create a plain text wiki. Basically the bundle allows you to create a main page in a project directory and then hyperlink to plain text files within that directory as the wiki pages. Furthermore, as Merlin Mann points out, this works perfectly with Quicksilver's plain text append and prepend actions. So if you're a plain text fan looking for a way to wiki, Matt's bundle is worth a look.