If you are an ad arbitrager making a ton of money on Google, you live a happy life. There's probably two main nightmares you have:

1. Google cuts you off.
2. Overture pulls your feed.

I think Overture is the more vigilant of the two at this point. For example, they pulled the feed from IntelliTXT, which now has to scramble to find ads that match their underlined words. They're currently backfilling with a lot of ASK and MSN search boxes being displayed.

¶ 11/14/2006