We can't get the level of detail we need using the "bulk" statistics available for our website. Our site has very distinct sections which we need to track separately AND cumulatively.
Google provides precisely the tool we need from opentracker. The snippet of code installed in every page can have an ID tagged to it for grouping data. We can use IDs for each channel and track them independently. By tracking the same information, but with the ability to break it down into channels we can get a much better picture of what is going on with our traffic.
Aside from this being a valuable feature for us, it might be prudent for Opentracker to implement this improvement. Google purchased Urchin and is likely to offer a light version right in their Adsense reporting. We run adsense ads on every page of our site, at least the ones we are concerned with tracking, so the Urchin lite would likely provide us all the reporting tools we need.