Yep, sorry about that. Normally I catch these immediately, but I've been out of town for 3 days, so this one slipped by me. Currently I have the forum setup so that it uses user-authentication (where they have to click a link in an email), but if this continues or gets bad I'll setup for admin authentication so that I have to authenticate all new forum members. It's pretty easy to spot the spammers because their email addresses are always gibberish.
-Brian