Cry Havoc on Bronzebeard.
www.cry-havoc.org I can put you in touch with the guild leader, Mythriel, or any of the generals. Alliance
Brewhaus on Whisperwind. Alliance. Guild leader is Varkos. He has a ton of alts I can get you in contact with him as well.
Royal Black Watch on Whisperwind. Alliance. thier forums are
www.royalblackwatch.net/forums/ You can leave a message there about wanting to do an interview on the guild. Their guild recently lost a player in real life that we were all good friends with. It affected the guild in more ways than one.
I can name quite a few others that are good if you're interested in a good list =)