I've been running my own significantly patched up version of the senderid-milter for some years now. Bunch of ipv6 fixes, other peoples patches, and some abusive rule handling (i.e. sites which advertise via spam have rules which always pass - so disallow inherently pass rules.)
If anyone cares about this I could bundle up my changes and post them.
Seems clear that this project is dead now. I prefer the senderid-milter to the various spf milters because for several reasons, but it may be time to move on.