Forums are a great way to get leads to your Website, but the major problem with it is the time consumption, and the audience you are displaying your sig. line to. As in most home biz forums, people are looking for information, and or want to sell, or provide a service. Not buy it.
Forums do however work in providing traffic on a relatively small scale,but in my opinion, from 4 years of it, the payoff is minimal compared to other formidabletechniques.
I have found a good combination of Website
SEO and PPC campaigning to work the best for myself. But each of us is different and have our own special talents, business idea's, and apptitude.