There is directory submission, blog commenting, article submission, social bookmarking, forum posting. What else are there, please list it and make this thread an informative thread.
Trading links with other webmasters, link ads, press release, guest blogging, pinging, authority posts, rss,..... Edit: Found a great post. Code: hxxp://courtneytuttle.com/2007/04/09/102-ways-to-make-your-blog-or-site-a-back-link-superstar/ Use google next time