When link building we are always looking for new link sources.  Here are some sites that DoFollow links from profile pages and the like

Video Sharing Sites

• www.youtube.com - Sometimes you can edit your profile, and agree to a Beta, where you will get a DoFollow link.

Photo Sharing Sites

• www.panoramio.com - Link from your profile page

Real Estate Sites

• www.zillow.com - HTML profiles, where you can have live links.