I have not linked the two because, for some reason, it makes me nervous. But if I do, will I be able to see how much each URL with Adsense earns? I have custom channels set up now, but they are per section, not so much per page. I'm trying to see how much each page earns with Adsnes so I can go after better-paying direct advertisers for particular pages.
What's great about the per-page Adsense reporting is the things that you can pick out by looking at the long-term stats. For just one example, I used to worry about irrelevant ads showing up on pages that Google's robots were obviously miscategorizing, but using the Analytics Adsense stats I found out that many of the pages that tend to get highly irrelevant ads actually have well-above-average CPMs. Things like this are very good to know, and you can't get these stats through Adsense itself (at least for a site like mine, which has thousands of pages with the same Adsense code).