Lutron vs Crestron Lighting: http://www.avsforum.com/avs-vb/showthread.php?t=875223
Crestron vs Extron vs AMX: http://www.vtctalk.com/showthread.php?t=39922
Archived chatter around similarities between Global View and RoomView: http://www.audioholics.com/news/industry-news/crestron-extron-lawsuit

Good mailing lists for AV:
http://tech.groups.yahoo.com/group/Crestron/
http://tech.groups.yahoo.com/group/Show-Control/