I had decided to use a Wiki for my recently created project on sourceforge: project IDC, id #185478 . Content is still small, but I want to move to a wiki before growing.
I already have experience setting up and installing MoinMoin on Sourceforge, but this time I was considering using MediaWiki, until I noticed this Wiki Beta program!
I think that a Wiki is a must for opensource projects nowadays. I'd like to beta test the Wiki beta before deciding to use the other solutions, which are all quite a pain to install in SF.