I'm working on a list of active online groups in the current FGW / give-us-proper-service saga and I've come up with the following. Hope to put it on a map (I have permission to use Barry Doe's lovely franchise maps as a base).  Please - anyone who knows of other active groups / discussions blogs that are GW-centric please let me know.

http://www.savethetrain.org.uk      Save The Train
http://www.srug.org.uk      Saltash Rail User's Group
http://www.irug.ik.com/     Ivybridge Rail User's Group
http://www.moretrainlessstrain.org.uk/      More Train Less Strain
http://www.fosbr.org.uk/           Friends of Suburban Bristol Railways
http://www.saveseverntunnel.co.uk/index.htm         Severn Tunnel Junction Campaign
http://commutertrain.blogspot.com/         Max's Commuter Train Journeys
http://firstgreatwesternsucks.blogspot.com         Great Western Sucks
http://www.farcegreatwestern.com/          Farce Great Western
http://ndrailusers.wikispaces.com/         North Devon Rail Users Group
http://www.severnside-rail.co.uk/         Severside Rail Community Partnership

[I have left off nationwide sites such as CANBER .. the clicky map will let people find local groups - that's the idea ;-) ]