Google has been busy with the AdSense product, this time adding channel tracking support for the referrals program. The Google AdSense whats new page says;
We've added channel support to our referrals feature to offer you more tracking flexibility. Now you can track the perfomance of your referral units across different pages, sites, or topics. You can also use channels to determine whether one referral design works better for you than another.
Better tracking is always appreciated.
Forum discussion at DigitalPoint Forums.