I had to turn word verification on this morning due to an increase in comment spam. We'll see if that is effective. Requiring Blogger ID's isn't, as some of the spam has come from bots with Blogger ID's.
Speaking of bots, I found this piece on pokerbots yesterday. There's a sucker born every minute, and apparently that sucker is playing poker online. To bring it full circle, the way you detect bots is by chatting them up using the built-in chat feature. Language is still the unbreachable man/machine wall.