[last night, I...]
pulled out the FG to ride to work and discovered that the BB cartridge had backed out ~1.5mm on the drive side. Yikes.
Pulled the cranks and cartridge bearing, cleaned everything up and re-installed. That gave me a chance to clean up the drive train, remove the useless freewheel on the other flip/flop side, and re-assemble.
Rode the FG in this morning. It was a bit cooler and not as damp, so a pretty nice ride. Glad to have that bike back in working condition, too.