Are they like a new breed of silent assasin spammers??  Uusally theyre trying to flog off viagra or super sex pills.  
Hey Placid Casual, weve had a handfull of dodgy registrations on forum last few days who Im banning, if you get any  probs with spam/abuse on the forum let us know and well try  tighten things up, I just dded captcha to new registrations too to thwart the bots.