Netcraft reports that several web hosting companies have disabled Movable Type comments because comment spam is putting a serious drain on their servers. The ensuing Slashdot discussion speculates on the problems within MT that allow this to happen, and it has some good ideas for ways to fix (or switch) your blog to secure it. (As for me, I haven’t had any spams since I implemented the “More than five links” rule. This doesn’t happen til after they post, though, which means it’s still tying up my server a bit. Now I’m thinking about a blacklist that would keep them from accessing the script…)