If you are using Subversion as you source control management system, there is now a way to go further with it and turn it into a full fledged project and knowledge management system.
Indeed, Arcetis has just released the first version of VoilaSVN Enterprise Edition, which "provides the tools to successfully manage your projects, to coordinate all your resources and capitalise on the knowledge of your team".
VoilaSVN leverages GWT to deliver a smooth web interface, which is pretty nice for a tool on which you will have to enter and mine data.
There is also a free edition, if you have simpler needs. So give it a try and, voila!, see how far you can go with Subversion.