Two of the lists I'm on that are fantastic for philosophy are GOVDOCS and GAYLIBN, though the droughts between deep thinking oases seem pronounced sometimes. I stick around for moments like these.
Right now on the latter, there's an awesome back and forth on NACO, Authorities, RDA, OPAC display and all sorts of other heavy duty cataloguing junk.
The initial uber relevant list question was something like "Hey, what do we do with trans people's authority records?"