[Ipstenu (Mika Epstein)]

I admit, I’m using the same tool (but I force all registration through WP so I run a plugin there). It’s actually used with Bad-Behavior and Akismet, since those were catching about 90% of the forum spam (and 99.99999% of the blog spam). Dunno what it is but you get more spammers able to make accounts via bbPress than WordPress.