Excellent time and opportunity to Twist yourself a Social Networking concept!
Social networks vs. dating sites
Commentary: Fragmenting may save online dating sites
http://tinyurl.com/magbx
There's a good little mix of a few Niche Social Networking sites But I'll Bet we'll be seeing a whole lot more...
(not totally uptodate but a good list)
http://tinyurl.com/7vybb
I know there's Great interest in MySpace marketing But don't forget Every other Space marketing.
Phil