As of a couple of days ago, the Slony replication engine now runs on Windows.
First of all, this is far from finished work. It's just the initial part that has it up and running and doing simple replication. There are many details still left to iron out. The most noticable ones being support for running as a service and logging to eventlog, but there are others as well.
The changes so far have been smaller than I anticipated. Dave has done a bunch of work on the build system, and the slonik utility has also seen a couple of win32 specific patches not too long ago. But the slon engine is the toughest part, and so far things are looking promising for a patch that's not very disturbing to the rest of the code.
While far from being ready to put in production, if you are looking into deploying Slony on win32 in the future, now is a good time to start playing around with it. Get the latest cvs snapshot, build, and test. And the most important part, give us some feedback on how things are working...