I just spent a good bit of time searching Google on how to get MacFuse working my 64bit Snow Leopard (10.6.3) machine.
Here is what I found.
MacFuse for Snow Leopard ( 10.6.3 )
You don't really need MacFusion 2 but it puts a nice interface on MacFuse. It included the SSHFS and FTPFS files systems by default.
MacFusion 2 for Snow Leopard ( 10.6.3 )
The plan is to work on a CouchDBFS implementation.