Model Mayhem - A great resources to connect models and photographers. I've done a lot of work through there.

One Model Place - A great site for networking. I worked with multiple models I discovered on there.

Modsheet - Another good site to meet models and photographers.

Malemodelsonline.com - "Our goal is to provide the most comprehensive listing of new and professional male models seeking work in the U.S.A and throughout the world."

Modellaunch.com -  The first online publication devoted exclusively to covering the world of male models and the image-makers of the men's fashion industry: the professionals who manage, photograph and groom the models and the designers who make the clothes they wear.