According to Hypergrid Business, Gay San Francisco is now a top 20 OpenSim Grid, with 127 Regions. This is August data, and given rapid growth, the actual number should now be higher.
I have not visited Gay San Francisco recently, I was there when they first launched and am amazed that growth has been this rapid. I plan to go back next week and report back to you here.
Here is the Gay San Francisco home page where you can create an account: http://www.gaysanfrancisco.us.com/