The closest I have found is on http://sawmillCreek.org. Turners forum. Great bunch of folks there and very willing to help. Of course it's not a dedicated bowl site but as close as you come. Even AAW doesn't have as good a forum as we do here.
There's also a newer site that I really like at woodturnersamerica.com.
I don't know of any site that's entirely dedicated to bowls, but both of the sites about have plenty of bowls posted as well as hollowforms, boxes, ornaments, and a host of other things.
I am a avid bowl turner and have turned thousands of bowls and I am a member of this website, it is very good--http://www.thewows.com , you have to join them, go to this website and ask Herman if you can join, the world of woodturners is his site, this is his where you go to ask Herman- http://www.hdv.net/
Aloha.
I wonder if there is a way to put this somewhere where everyone can view and click on them.3
I started a list, will get it put in the library and Wiki!