The guys behing DuoBlogger, a blog created to share knowledge with webmasters and online advertisers (they did a great reveiw of WordStream recently!), are offering a new iPhone app that AdSense users should find interesting (and it's free!):
DuoSense is an advanced AdSense application aimed to both track and analyze your AdSense income. Core features include showing daily earnings, advanced plot-able statistics for earnings, PPC and CTR, plus a help center with AdSense coaching tutorials.
Here's a quick video showing how it works: