Just wanted to give this a bump. The BTH is still going strong and we are about to finish up our 8th season. We are always looking for new players and GMs. Of course, you only need to own OOTP 6/6.5 if you want to be a GM. I recently took over as commissioner of the BTH and I have been running player leagues since 2004 so I can guarantee you'll be joining a great, well run league!
Bring the Heat - An OOTP Players League
http://www.bthleague.com/forum/index.php