What Methods (Both Online And Traditional) Have You Found To Be Most Effective For Promoting Your Products, Services Or Events?

Over the past few months I've been researching various ways to promote products, services and events. On Linkedin I have seen people use groups to successfully promote networking events and workshops. Others are using tools like Kijiji, Facebook Groups or Marketplace to reach contacts directly. Newsletters are still useful for many businesses, and when I pick up a newspaper I see the good old fashioned print ad that seems to be successful for many companies. 

As entrepreneurs in the KW, Cambridge and Guelph areas, what methods do you find are most effective ways to reach buyers and customers? It would be great to compile a list that we can all use as part of our business plans.

Note: Also posted on the Linkedin Group Site for KW Entrepreneurs.