I tend to use Arial or Helvetica on my sites, but that's because of my personal preference (easy-to-read fonts), Adsense was never a consideration.
I use non-matching fonts, because I simply don't like Arial much. I choose fonts based on what I personaly liek the look of, & I'd never thought about matching my fonts to Adsense! Besides, I don't usually like my ads to blend in too much.
Hi, I go with Verdana. I've read somewhere that it is the most readable font within the Windows Standard Fonts. I don't know if this is true but the adsense font would be too small for me anyway. kind regards from Vienna Andreas.
I go with Tahoma as the normal font, and Verdana for the H* fonts. Dont like Arial that much, but maybe i'll give it a try with a next site.