If you're on Facebook, grey_death, have a look at the Sheffield Irregulars
There are ups and downs with using
FB as a medium, I've found. It makes organising things a lot easier, thanks to it being a centralised communications platform. On the flipside, as anyone can talk there is the potential for a high noise ratio.
Also, the recent change to the Group layout is annoying, though Fan pages seem to work well for the Painting Corps.