I know a few Tennessee Bellas have signed up for the Florida Ironman in November '08 and the Gulf Coast Tri is a big draw. Outside of that, I'm not sure (not into that myself). I'll try and find out for you or direct ladies to this thread.
Hey... I'm getting a group of ladies together to do the JCC Tri it On here in Nashville. We will be training together and taking donations for our training to support the Refuge Center For Counseling. Here is the weblog that we just set up for it. http://www.TheBootCampBody.wordpress.com