Anyone using Scruff/Grindr?

I’m finding them interesting.  I’ve been using my friend’s old Iphone 3G as an Itouch and remember some of the cool things about the iphone that I used to enjoy when I was provided one for free at work.  My Droid has a couple of programs which try to do the same kind of GPS-gay-locating thing like Encountr and Purpll, but neither of them really have any critical mass, even in this gay Mecca of the Bay Area.