Advertisment techniques that work

I was searching on the web about different advertisment techniques that have worked well for companies and I found one article which listed many different types of advertising techniques.
http://www.squidoo.com/advertising_marketing Two of the most interesting I found from this article was Blogging and using ebay and classified ads. They said the key to writing in blogs and using it as an advetisment tool is making sure you have good content and to make sure to use word press (which is a free and open source blogging tool). He really put a lot of importance on using word press which was interesting. The second advertisment technique I found interesting that it was a good tool, was ebay and classified ads. In using ebay they say it is a good way to get leads and you can put a link right to your blog for more info about what you are selling. I read through many different advertisment techniques and its amazing all you can do to get your product or service out there!