Getting links from other websites is another fantastic way to ensure high search engine ranking for your site. A couple of years ago reciprocal linking used to be the main thing and I was actually able to attain number one spots through simply swapping links with other sites instructing them to use my keyword phrase in the link text to my site.Today Reciprocal linking is much less effective but getting ONE WAY links to your sites still is a great way to boost your ranking.Here are a few:

Testimonials - Write a testimonial for a product or service adding your link at the end of the recommendation.
Useful Content - Having GREAT content or providing a fantastic resource will get webmasters naturally linking to your site. This is the BEST way to ensure one way link backs and to provide quality too.
Submit to Forums - Register for online marketing forums adding a link to your site in the signature of your post, again this is a one way link back to your site.