tedster - 7:20 am on Apr 16, 2010 (gmt 0)

The details appear in Google's Investor Relations section: Google First Quarter 2010 Financial Results [investor.google.com] The big revenue winner (no surprise):

Paid Clicks – Aggregate paid clicks, which include clicks related to ads served on Google sites and the sites of our AdSense partners, increased approximately 15% over the first quarter of 2009 and increased approximately 5% over the fourth quarter of 2009.