Topic: Idea to avoid spamming
Well, I'm no coder so I can't tell you if this will work and it is just an idea......
What about having the user been redirecting to a thread, after registering, called "introduce yourself" to write a few words about himself and if he don't do it, he get banned directly.
...or there could also be a textfield at the registration site that feeds that thread and if leaving empty no registration is possible.