These forums will often allow you to leave a link to your site in every post. The ones that are open to public viewing for visitors are also frequently spidered by search engines.
If you set up your link correctly, you’ll then have topical links back to your own forum. Even if the search engine spiders can’t see these links at forums that can be viewed by registered users only, you will also find that once you become a part of the community, other members will click your link out of curiosity or because they’re looking for something specific that you may have at your site.
Even forums that exist to gain more sales of their own products often allow you to post your link, especially if it isn’t to a competing site. For example, internet marketing forums run by people who sell do-it-yourself SEO products may allow infopreneurs who sell a different type of product, such as an autoresponder service, to post their link freely.
The focus here, at all times, is to help other members, not just to promote your product.
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