AdSense Expandable Ads For Increased Interaction

Has anyone seen expandable ads on their sites?
Expandable ads are
- rich media media ads that can expand beyond the original size of the ad unit - priced on a cost-per-click (CPC) or cost-per-impression (CPM) basis - available only if you are located in North America or Europe; added the AdSense code directly into your site's source code; and enabled image ads
I look forward to seeing how this will actually work, and more importantly contribute to the bottomline
https://www.google.com/adsense/support/bin/topic.py?topic=19440&sourceid=aso&subid=ww-en-et-asblog_2009-03-04&medium=link