I've linked my adsense a/c to analytics for 3 weeks now and it's just awesome! When you sign into analytics, under "Content" you will see a link for "Adsense" and the stats it shows are pretty impressing. You get to see each url of your website along with the revenue that it is generating and the number of clicks. You will also see how much money you've made from what referrers. I've barely look at custom channels these days because the stats from analytics tell me so much more and shows me exactly which content page are making the most money and where i need to improve. If you haven't yet linked your adsense to analytics, do it now and for those who've already done it, tell me if you've found it as useful as myself.
i have only very recently done it - still getting used to it I have a lot of custom channels set up, so if i could get everything in one place it would really help