An RP guild would be awesome! I would definitely be down to join.
I do have some reservations though with trying to mix evil and good together too much. How can a follower of Mithaniel Marr group with a child of Innoruuk? Or better yet, how could a paladin of Rodcet Nife ever be around a follower of Bertoxxulous? They are just too polar opposites. I guess the characters in the guild would have to have some animosity towards one another if we were to keep everything unified, but if I am playing a healer of Rodcet Nife, in order to stay in character, I could never condone the actions of a necromancer of Bertoxxulous as they want to spread disease and blah blah blah you all know the back story.
There are exceptions of course. I have RPed as a necromancer and my friend as a paladin and we RPed that we were brothers and we had some complicated back story about our father being slain by the undead etc. to tie it together, but in general, it would be hard to make such a bind to hold a very open RP guild together.
If the majority wants to make a unified RP guild, I would make an agnostic character just to be apart of it. Probably a half-elf bard, but I am almost positive I would lapse into something along these lines
http://www.youtube.com/watch?feature...uTo7zKM8#t=17s
I like the idea of having a Good and Evil guild though. I would have characters for both of them. If a lot of people had characters in both, we still have the numbers without weakening the immersion too much.