The Wiki is good, the Wiki is wise
For the past few years, I've been using Sharepoint for my development portal. However, it doesn't seem to be the best tool for building out documentation on our development projects. A Wiki seems like a much better choice. I've started using ScrewTurn Wiki. It is written in .NET 2.0 and is very nice. ScrewTurn is very lightweight, easy to use, looks great, and has no need for a database. The next major release will add plug-in support and a number of other features. Give it a try...I think you'll be impressed.
It looks like Microsoft seems the benefits of the Wiki approach too and is adding Blog and Wiki support to Sharepoint Services Beta 2 Refresh. That should keep things interesting.