Link Building Tip 1

Don't forget your internal links! Breadcrumbs, for example, are a great internal linking tool. Use them for usability and anchor text differentiation.

Link Building Tip 2

Set up a campaign in Google AdWords' content network, to determine which (relevant) websites generate traffic and conversions. Contact those websites directly and try to get a link.

Link Building Tip 3

The most important link building related question is 'Why?'.
Before you start building links, you'll have to ask your self "Why would someone link to our site?". If you have trouble answering this question, you'll probably be better off building remarkable, link worthy content first.

Link Building Tip 4

Testimonials rock! Offer to write testimonials or a quote to your suppliers, if they are willing to link back to your site in or near this testimonial. Also, you can ask clients to write testimonials about your product or service that they publish on their website, in exchange for a discount or something similar.

Link Building Tip 5

Optimize your existing links. Contact the webmasters of prominent websites that link to you and ask them to change ‘click here’ to an anchor text that contains relevant keywords, an anchor text that encourages clicking through, or -ideally- a combination of both.