One of the reasons I went to the Movable Type 3.11 was to have the MT Blacklist plugin, which works pretty well. The nice thing about the 3.11 version is that it would update automatically, instead of daily cut-and-pasting.
This morning I found that the decision was well worth it: my logs show that I had OVER 400 comment spams blocked automatically overnight (and all from 2 IP addresses, which are now banned at the server).
Anyway, the plugin works very well, and I highly recommend it.
