I just got back from the lab where a very happy Tom (mystic) and Cesar (cesar) were showing me a distributed Mozilla Win32 build using their patched distcc. They have had distributed builds on Win32 working for a while, but a bug with the Mozilla build kept them from releasing. Last night they found the culprit (another space!) and now it works.
Their project page is here, binaries here, and sources available at svn://cdot.senecac.on.ca/distcc/trunk/. Great work guys!