Theres a few thigns you can do.
1. paid advertising (type ppc into google)
2. SEO
3. press releases

I've found the most successful to be press releases personally, i've got over 100 visits to a forum in about 4 days (it was a forum for joomla based small businesses, not big news). 100 hits isn't heaps but it wasn't major news, . If you have some juciy news the major news networks pick it up and you'll have thousands of hits within hours. i've heard seos say they got 15 sales within 2 hours of releasing a press release.