Campus (94305) is looking quite a bit shape-lier after the changes I made last week (which finally rendered in Mapnik):

osm.org/?lat=37.42817&lon=-122.17105&zoom=15&layers=B00FTF

The Cayman islands look good again, at least in OSMArender (perhaps they'll be fixed in Mapnik by next week):
osm.org/?lat=19.266&lon=-81.231&zoom=11&layers=0B0FTF

Alas, I noticed a few more visual bugs:

Especially in New Orleans...
osm.org/?lat=29.601&lon=-89.931&zoom=9&layers=B00FTF

Might have time in the future to look at it, but for the moment have been filing Mapnik tickets, hacking, and making lots of changes to the Mapnik wiki! http://trac.mapnik.org/wiki