Try doing a site:domain.com search, like this
http://www.google.com/search?num=100...:thetgirls.com
If you see a lot of repetition in the serps, then there's a good chance you have will have problems with dupe content. The more you change on each doorway (titles, metas, text on page, ads, recip tables, etc) the better your chances for getting SE traffic.
Yours doesn't look too bad.