There are many sites like odesk.com , eZdia.com , getafreelancer.com , guru.com etc. But now days I prefer eZdia.com because it is the best site in the market today for individual freelancers who are serious about taking advantage of the many benefits of their expertise. The system follows the clean way,just put in your expertise in the knowledge bucket here and the your luck will find your way. You will like to have a look at ezdia.com
www.maximumedit.com will be a site directed just for graphic designers, writers, and animations / video editors. Hasn't launched yet but I've heard good things about the beta.