I run a few very large adwords campaigns and after one of my new campaigns didn't show ads for a month I contacted google today. Their response was that the ads hadn't been reviewed yet. Ummm, it's been a month, nice job google, way to drop the ball.
I believe it. Today I woke up with an email from adwords regarding a typo in one of my ads. I wrote this add like 6 weeks ago. I was wondering what was happening now this explains it. I wonder now how many of my ads are still unapproved.