Alfresco

With the advent of credit crunch, and the potential sale of the business I'm working for we have started going down the road of open source.
My first project was a chat server (for which I used openfire), this is now up and running and has been approved after proof of concept to be rolled out to selected individuals within the business.
Second project was a micro blogging site, for this I used laconica, although in it's infancy is a very good product.
My only bug bear about open source the is the documentation.

My current project is to find a sharepoint alternative, I'm currently looking to implement alfresco.