some high page rank(PR) forum site for backlink building

To get a good place on search engine you mast want to do off page seo with on page seo. Back link building is most important part of off page seo. You was lrady know how to get back link from a forum site.
here is some forum site to make good quality back link.

1. http://www.v7n.com/forums/
2. http://www.submitexpress.com/bbs
3. http://acapella.harmony-central.com/forums/index.php
4. http://forum.joomla.org
5. http://forums.searchenginewatch.com
6. http://forums.cnet.com
7. http://forums.mysql.com
8. http://forums.digitalpoint.com
9. http://affiliate-marketing-forums.5staraffiliateprograms.com
10. http://www.bloggertalk.com/forum.php
11. http://www.sitepoint.com/forums
12. http://warriorforum.com
13. http://www.phpbb.com/community
14. http://www.seoforum.net.au/seoforum/index.php
15. http://forums.seo.com
16. http://www.siteownersforums.com/index.php
17. http://www.webhostingtalk.com
18. http://www.directoryjunction.com/forums