I gotta say, these spammers sure are persistant.
Every day, without missing a beat, there's at least one piece of spam, all worded in similar fashion, all by a newbie, offering free merchandise.
hmmm. I wonder if locking on in the syntax might prevent then from posting.
Or, perhaps. making registration somewhat less than instantaneous, say requiring an email be sent to them and having them then login to activate their registration. It might not be 100%, but at least they would have to work for it.