Dan Schawbel has a timely piece on Mashable at the moment on using social networks to build your resume.
Schawbel list 10 useful social networking sites to help you strengthen your resume and (surprise!), LinkedIn isn't the top of the list. Razume is a sight designed specifically to all resume development; you get feedback on your resume from a community of other users.
You can take a look at Schawbel's complete list of sites to help polish up your resume here .