Well, one I recognized recently (actually not his fault) was in cs_assault. The bots get stuck in the room in the sewers (with all the computer monitors). They move right next to the ladder, stop and then run back into the computers (I think the bots believe they have already gone up the ladder). I wasn't sure how to fix this one.

As for his #1 favourite getting bots stuck methods (I'll post pics on the site soon):
de_dustier
- going into the sewers. The bots don't seem to duck where they should to continue moving.
- in the tunnels, breaking through the grates and then crawling through. The bots don't learn to break the grate and get stuck in the corner.

any_othermap
- jumping up on top of friends' heads and reaching otherwise unreachable crate tops
- walking very close to the walls so the bots get stuck on them

On an unrelated note:
On iceworld maps, the bots insist on shooting the ice in the middle of the map. Even with realbot debug dontshoot 1 on. They don't, however, shoot glass windows or that grate in dustier.