John Alexander with Beyond SEO and Search Engine Workshops is a great resource for people looking for unique link building advice. I often find interesting points from him that I like to share with my readers. For example, he recommends:

"Work on building rapport with other Webmasters. By building up a "working rapport" with other local Webmasters or affiliates, there are lots of ways that you can mutually benefit by trading links with several similarly themed sites, which are non-competing. Once you start working with other Webmasters, it's surprising what synergies may develop. Remember to give your very best to your fellow Webmasters as these relationships are win/win."