Link building is a huge booster to any site.  There are a number of ways to go about this and the limits are literally infinite.  It’s not every site that I work on or build that I get nitty gritty with Linkage but when the opportunity presents itself I ofter refer to the famous “Link Building 101″ pdf.  I have had this taped above my computer for more than a year and it shines down upon me every single day reminding me the importance of Link Building and always when designing to think SEO.  The poster comes from Dave Conklin from ProspectM.  Enjoy!