If you have been on an "Official" Retrobike organised ride then you can get your "Retrobike Rider" banner.
If you are a hard man and live North of the Border and have also been on a Retrobike sanctioned ride then you can get your "Macretro Rider" banner
The terms of getting the "Gold Trader" banner can be found in the "For Sale" forums I believe (something like 30 good feedbacks left on your feedback thread).
Botm (Bike of the Month), Rbotm (Road bike of the Month) and Potm (Picture of the Month) speak for themselves, you get these banners when you win the competition!
"AEC/Deputy AEC" you only get if you are a Retrobike Area co-ordinator, with great responsibility comes a shiny banner
"Moderator" banners are given to those who sit on their arse drinking tea and dunking biscuits
And they also work tirelessly behind the scenes to make sure the Retrobike site doesn't implode on itself.
PS: Mods.... is it possible to have both the "Retrobike Rider" and "MacRetro Rider" banners simultaneously???