I think its after 10 posts you get upgraded.
Theres several levels... if I remember rightly you hit the next one at 50 posts..

Just a bit of fun really

Sam
http://www.shredderteam.comhttp://www.shredderteam.com
http://www.robotcrusade.comhttp://www.robotcrusade.com

P.S Hmmm special.. Ill say