Has anyone else noticed this in their account(s) today?
Google replied today and said:
Any changes you made to your ad campaigns between April 14, 2008 and April 17, 2008 were not reflected between the hours of 5:00AM and 11:30AM (PST) on April 17, 2008. Because of this, you may have been incorrectly billed for traffic you received during that time.
(That's certainly odd behavior. But anyway...)
They're still looking into if/how much I should be credited for those clicks.