I've been using Adsense since 2006 and I have to say 2011 has been my best year yet, even though I disposed of my two biggest earners in late 2010/early 2011 and haven't added any new sites to replace them.
I seem to get a lot of ads for those daily deal websites. I guess they suit my geo websites well? I'm not sure if the competition in that market is driving up my earnings, but it's the only explanation I have given that my traffic isn't increasing that much.
My websites all have a fair bit of content too, so I've probably benefited from some of the 'minisites' being punished by the Google update.