The one and only stats tool for mainstream and adult affiliates: NiftyStats
You need it; period.
Nifty Stats is a desktop utility, which automatically in regular intervals downloads the stats from your affiliate programs, affiliates networks, advertising networks. Nifty Stats brings automated statistics right to your desktop for any time frame pre-defined by you – and it shows these stats in real time and on regular basis. It is 100% safe and entire communication runs just between your computer and the server of your affiliate program.