My Adsense has normally chugged along with small amounts, but over the past few months its being going crazy.
On the one hand, I have been focused on better quality sites, and pushing traffic in - on the other hand, I know my Google Adsense account underwent a manual review a few months ago, as well, so there's a good chance I'm also away from price matching territory.
The ironic thing is that while I built many of these sites originally for links, I'm not actually using many of them for this at present, with Adsense being used as a stop-gap before selling site sponsorships.
The overall result is that over the past two months my Adsense earnings have actually become higher than any individual client on my books. In fact, September looks as though Adsense will account for 25% of my company income.