Google has announced on their AdWords Weblog that you now have the ability to track search and content clicks separately. This is great as you can now see what traffic is working for you. Often i find that Google’s search partners and independent websites that have AdSense on them do not convert nearly as well as users that click AdWords on the main Google site.
Take a look at the AdWords Blog from Google in the above link. It has lots of great tips and should be required reading for anyone spending money on AdWords.