Very simple list of link building do's and don'ts from a professional marketer and SEO consultant.

DO:
Visit sites like Tipstrs.com and blogs and post relevant comments and information (and then place your link at the bottom)

DON'T:
Spam sites just to get your link. It can get you banned quickly, and nobody like's a sales pitch.

DO:
Create unique articles and distribute them across the web 2.0 universe

DON'T:
Submit to 1,000s of article directories, you are simply posting duplicate content and can get your site blacklisted from the search engines.

DO:
When writing articles offer great absolutely free information without the necessity of opt-in. Answer the searchers queries.

DON'T:
Jump into a salespitch.

DO:
Join forums with DOFOLLOW clauses and put your link in your signature (and reply with good content).

DON'T:
Join any forum and spam your link.

DO:
Post videos on Youtube/etc. and give step by step instructions with either a slight watermark at the end or a end-title sequence with your salespitch.

DON'T:
Make bogus titles to attract viewers.

DO:
Realize that sometimes paying someone to do the work is a better use of your time.

DON'T:
Overpay.

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