For those advertising on Google or running campaigns on Google, there is a new report available now finally allowing you to see what sites in the content network are driving clicks. I recommend immediately running this report for any of your campaigns driving content network clicks and examine the sites that show up. You will likely find tons of "domain Ad" and "error page ad" designations driving the most volume. These are the domain squatter type AdSense spam sites you see on the web that often infect machines from download sites like LimeWire and BearShare. If you identify a site that looks like garbage, and I am sure you will, go in to the "excluded sites" link in AdWords and add that domain. Save some money!
Then go take that money saved....spend it on the sites that are showing in the network that are useful. A typical optimization step in any good campaign is finally now possible in the Google Content Network.