There are some most power forums are here

Dofollow forums helps increase Google Page Rank.I have already discussed in detail about advantages of dofollow blogs.Everyone likes their site to be popular with high amount of traffic.Here I have provided a list of 100 Dofollow forums. Keep in mind that you reply or ask questions related to the topic of discussion else they will consider as spam.

Find More - http://www.freewindowstips.com/2010/09/01/top-100-dofollow-forums/