JenSense reports that rounded corners are now available to AdSense publishers as a new format option. Most publishers leave the border off, so this feature should not have widespread appeal.
The following code is added to your script if you select rounded corners:
google_ui_features = “rc:6″; [slightly rounded]
google_ui_features = “rc:10″; [very rounded]
google_ui_features = “rc:0″; [default, square corners]
If your site has lots of rounded corners and you have an example of using this new feature, post the link in comments.