Tulsa D&D Yahoo Group
Okgamers Tabletop Games Forum
Tulsa Gaming Central - Hasn't seen any action in a while, but I finally managed to get into the group after a week or so.
D&D Sand Springs
Tulsa Living (Living Campaign role playing games)
OklahomaGamers - I've been waiting nearly a year (since 4/30/09) for approval to join this group. So you might just want to skip this one.
I just received my approval to join OklahomaGamers, as of May 8, 2010. So submit your request now! and you may be a member by sometime in 2011!
The Oklahoma Gaming Guild
If you know of any other online groups please add them.