Will this work having the same really big forum and buying domain restoring the site on each domain and link to each other. Will that created a link wheel?
Why waste the time, plus that is considered a "link scheme" which is against Google Webmaster Guidelines; review below. You should spend your time on one domain providing unique quality content with the basic backlink building methods. Unique quality content will generate plenty of natural backlinks, people link to good content. http://www.google.com/support/webmasters/bin/answer.py?answer=35769 http://www.google.com/support/webmasters/bin/answer.py?answer=66356