Trying out something new with the Wiki - the ACTION Advertising List.
This page lists each bus in the fleet, and what external advertising they feature. Three columns - left, right and rear. Given the relatively low number of ads doing the rounds these days, together with almost 200 new(er) buses which only carry rear adverts, this is a bit more achievable than it was a few years back.
Changes can be tweeted @actbusfleetwiki, or you can use the contact form located on the Wiki sidebar.
We'll need a bit of help to initially populate the form, but once it's all set it should hopefully be minimal upkeep.
As I mentioned, it is a beta. Feedback, suggestions and whatnot are all welcomed.
The page can be found here: http://www.actbus.net/fleetwiki/index.php?title=ACTION_Bus_Advertising