Anyone get a user registered as steve123? It's from an israel ip and the weird thing is it registered at a website that's not published and when I goggled the name I noticed his name also popping up on several simplemachines forums with zero posts... maybe I'm paranoid.
I noticed this on my test site too. Odds are they signed up to send you some spam. I would remove the account and look at banning the email address.
I normally do a google search on spam bots
http://www.google.com/search?hl=en&q=steve123&btnG=Search
Also make sure you have visual confirmation turned on to help avoid the spam bots.