Modelmayhem - Modeling networking site - Great place to meet photographers, models, makeup artists, hair stylists, wardrobe stylists, clothing designers, etc. Social networking tool that can also be functional depending on your luck wading through the flakes (though that's universal to all internet modeling sites). Still, there are quite a few working professionals on there (I've made friends with plenty), and sometimes it's surprising seeing who's on there. It's worth checking out if you're curious about the whole modeling scene.
*edit* woops, shoulda put this in the other category =P