For link building in SEO you many need this SEO forum site list.
Give a look...
2. http://forums.digitalpoint.com
3. http://www.seoforum.net.au
4. http://forums.searchenginewatch.com
5. http://www.v7n.com/forums
6. cincyforums.com
7. http://searchengineforums.com/
8. http://www.abakus-internet-marketing.de/foren/
9. http://www.sitepoint.com/forums/
10. http://www.akamarketing.com/webmaster-forums/
11. http://www.highrankings.com/forum/
12. http://www.seochat.com/
13. http://www.ihelpyou.com/forums/
14. http://www.searchguild.com/
15. http://forums.searchenginewatch.com/forum/
16. http://www.seo-guy.com/forum/
17. http://www.webmasterworld.com/home.htm
18. http://seo.anthonyparsons.com/forum/
19. http://www.aosep.com/
20. http://www.buscadorespanol.com/foros/
21. http://www.cre8asiteforums.com/index.php
22. http://google.dirson.com/foro/
23. http://www.forobuscadores.com/foros/
24. http://www.forums-abondance.com/referencement/
25. http://www.geeksonsteroids.com/forum/
26. http://forum.html.it/forum/
27. http://www.ihelpyouservices.com/forums/
28. http://forums.lilengine.com/
29. http://www.ozzu.com/
30. http://resource-zone.com/
31. http://forums.searchenginewatch.com/forum/
32. http://www.seoblackhat.com/forum/
33. http://www.seochat.com/
34. http://www.seo-forums.com/
35. http://www.seo-guy.com/forum/
36. http://www.seo-debat.dk/
37. http://www.seoplace.com/
38. http://www.seoproject.com/forum/
39. http://www.seorefugee.com/
40. http://www.seotown.com/