I’ve been messing around with the face recognition features of Riya, and it’s pretty good. Although as you can see, sometimes it doesn’t quite hit the mark.
It’s a neat idea though. I don’t know how big of a player they’ll turn out to be, since Google ended up going with someone else for their recognition software for Picasa, and now Riya.com is just trying to be an “also-ran” in the image search arena. But if they can get a good Flickr integration going, who knows.
Check it out though. It’s fun to play with.