Perhaps a "rating" site for the top browsers (MS Internet Explorer, Netscape, Opera, etc.) or even for downloads/tools/other complementing resources. Development could really bring this one to life (and increase value), IMHO.
Best of Luck.
Yup, a good niche domain for rating the top browsers as well as a forum for sharing tips and tricks! Will definitely be popular if developed right! I would say $30+ undeveloped!