Hi,
Just found this (via an e-mail from dreamhost) and have just installed for the 1st time, simple, nice and LOTS of potential.

I have been one of the developers of another project of similar proportions namely phpCollab and hope to be able to get active and involved with activeCollab (aC) I have taken a look around the code via the trac and have some ideas and features that I'd like to see and hope to contribute to.

Great work so far though :-)