People regularly ask where the best place is to meet models, make up artists & find studios, Model Mayhem & Purestorm are good, but the best I have found by far is PurplePort. A generally high standard of image quality, an ever growing population, and fantastic forums to ask questions and join in deep conversations about anything and everything photography related.
This is a link to their sign up page: http://purpleport.com/signup/?referrer=arcphotography
Using that link adds me as a referrer which also helps me out but you don't necessarily have to. This site really is something not to miss out on, even if it's just for ideas and inspiration.