Eric Ward at Search Engine Guide writes about the power of the passive inbound link. In short – a passive link is a link you don’t buy, ask for or trade links for. His premise is that passive links are a more powerful type of link than others – especially reciprocal ones. Search Engines treat such links as a vote for the authority of your site.
This is one of the strengths of blogging – write something original, clever, witty, powerful, touching, insightful, controversial (linkable) and the links tend to come in. Whilst you can spend all your time emailing people and asking for links with the offer of linking to others, the best strategy for getting passive links is simply to run a quality blog.
If you want an example of this principle currently in progress check out what happens when you land a big story – like the Engadget interview with Bill Gates today. I must have seen at least 15 links to it in the past hour and technorati reveals more.