I recently decided to create a WIKI for capturing technical tips and documentation at work. The key was to be able to get something up and running fast as well as allowing for multiple people to add, change, and delete posts (which a WIKI does well). I settled on
Instiki as it runs on "Ruby on Rails", includes an integrated database (
SQL Lite), and an integrated web server (running on port 2500). I had the WIKI up and running in about 5 minutes and was configuring and modifying the layout of the site. Within 10 minutes I was adding content. Doesn't get much easier than that :)