1. Syndicate a press release. These not only build links from the site they were released through, but also may be pickled up by blog writers, industry writers etc.
2. Write articles for sites such as ezine articles and article dashboard.
3. Submit to premium, relevant directories.
4. Email webmasters in your niche and ask for a link from their site.
5. Answer questions on Yahoo Answers that are relevant to your niche, then you can legitimately include a link to your site.
6. Blog every single day. Link to other relevant blogs in your posts.
7. Submit your blog posts to social media such as Digg and Reddit.
8. Make your site easy to link to, perhaps offer a link page where people can get banners to place on their site.
9. Submit classified to Craiglist.
10. Use a reputable backlink building resource, such as IBL Builder.