I would like to know if a particular company uses Google Adwords – I am researching their ads. Is there some kind of directory for Google Adwords users?

I have a website and want to network….please inquire for details

I have an online store and the profit margin on various items range from about 20-$100. I have heard PPC advertising does work, but I have tried it with my store and it just did not work out.

I am an affiliate with a shopping website. I need to advertise it in order to make money. I am willing to invest $200 a month in advertising other than adwords, adcenter, yahoo marketing. Those are expensive. Any advice out there?

For example:

A publisher launches a site about dogs. The publisher invites freelance writers to contribute stories about certain dog types. Instead of paying the writers for the stories up front, the publisher pays the writers a percentage of the revenue that their stories generate. Revenue is generated by pay-per-click (PPC) ads such as Google Adsense, cost per thousand (CPM) ads such as banner ads, and affiliate programs, such as the one offered by Amazon. Are there services that facilitate this arrangement?