That's kind of a difficult question to anwser, you should try to find the most important forums within your niche and promote your products there.
JM007 is right. In order for you to rank higher , you need relevant links. Besides, Most likely people in forum closer to you niche will buy your products.
It depends on the type of site which you want to promote. Like if you have celebrity pic or Hollywood related site then you must promote it in celebrity forums likewise if you have technology site then you must promote at technology forums. Its because it will increase your sites SERPs and will bring you valueable traffic as well ...
Well this is a rather pointless question, because even if there were an answer it wouldn't have any benefit to announce it. So, I'll just be cheesy and say DigitalPoint!
Here is the list of some renowned forums. Please get registered and know how much they are popular and responsive. # http://forums.digitalpoint.com # http://www.sitepoint.com/forums # http://www.webmasterforums.com # http://www.allcoolforum.com # http://www.warriorforum.com # http://forums.webicy.com # http://thehyipforum.com # http://www.webmasterforumsonline.com # http://www.webmasters.am/forum # http://www.webmasterforums.net # http://www.devhunters.com # http://www.webmaster-forum.net # http://www.geekvillage.com/forums # http://www.zymic.com/forum # http://www.webmastershelp.com # http://www.webmasterdesk.org # http://www.webmasterground.com # http://developers.evrsoft.com/forum # http://www.websitebabble.com # http://www.talkingcity.com # http://www.australianwebmaster.com # http://www.wtricks.com # http://www.forums.webzonetalk.com # http://www.htmlforums.com # http://www.searchbliss.com/forum # http://www.webmasterize.com # http://www.webmasterserve.com # http://www.freehostforum.com # http://www.seorefugee.com/forums # http://www.cre8asiteforums.com/forums # http://forums.seo.ph # http://forums.delphiforums.com # http://www.web-mastery.net # http://www.webworkshop.net/seoforum/index.php # http://www.webproworld.com # http://www.bzimage.org # http://www.v7n.com/forums # http://www.dnforum.com # http://www.webcosmoforums.com # http://forums.webicy.com # http://forum.hittail.com/phpbb2/index.php # http://www.affiliateseeking.com/forums # http://siteownersforums.com/index.php # http://www.webmaster-forums.net # http://www.geekpoint.net # http://www.smallbusinessforums.org # http://forums.ukwebmasterworld.com # http://www.experienceadvertising.com/forum # http://opensourcephoto.net/forum # http://forums.seochat.com
Find your niche for the forum you want, forums are mainly based on niches. Dating, video games, health, etc.
Even I agree with others. According to the domain your business you should search for the relevant forum. The number of members, location it is catered and how active is it ? All plays an important role to make it best
to promote a product, search a forum for your niche and active there. But to increase PR and SEO, active in a dofollow forum is better.
I do agree with others. Just go for a forum for your niche and remember it should be do follow. It will be the best forum for you.