Phil,
I was just there not too long ago and I listened to the state 800 all the way down tracking OHP and then all the users on the state 800 in the actual metro. Oklahoma County SO is still conventional and makes for good scanning. EMSA is still on 463.175 Norman, Edmond are good trunking sites as well. If I went down today I would focus on the state system as well as all the other trunked stuff. What part are you going too?
P.J.