Hello, I just got an email from AdSense team that they wil be tweaking a few more updates regarding to fonts, so that Ads will look more natural and nicely fit in with AdSense displayed websites.

So, to get more precise information I will quote here..

Currently, most ad units set to the AdSense default font face are displayed in Arial, with a few in Verdana. Here are the new default font faces we’re launching for our ad units:

Arial: 728×90, 336×280, 120×600, 120×240
Verdana: 300×250, 160×600, 468×60, 250×250, 234×60, 125×125, 180×150
Times New Roman: 200×200

So, tweak your AdSense Ads and generate your income better than ever.