Google announced they will be changing the default AdSense font type. Testing revealed to Google that different font types and styles work better in different ad formats and the network is changing to try and optimize ad unit performance.

The default font faces launching for the ad units include:
• 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

Now is a good time to test how each of these ad sizes and unit fonts perform on your own sites. What has worked best for you in the past?