The Google Content network is probably the holy grail for advertisers at the moment.
Tons and tons of traffic, dirt cheap, but very few people have figured out how to make it work for them.
Pay per click and adwords is Glenn Livingstons business, all day every day, and he is someone very respected within the internet marketing community when it comes to Google and Adwords.
Here is a quick video courtesy of his payperclicksearchmarketing.com site showing you how to get started quickly and effectively with the content network
AdWords Content Network Themes – Maximizing Results in Minimum Time
cheers,
Rich Paylor 
