jomaxx - 3:00 am on Feb 16, 2010 (gmt 0)
It's not about ads on the side or at the top in the Blue Box.
FWIW, I don't see the ads at the top left of the SERPs in a blue box. They're "set apart" by putting them on an extremely faint yellow background (#FFF8DD). Also the words "Sponsored Link" appear way over at the far right. Can't say I care for Google stealing the #1 spot in the search results, but it's part of a longterm trend.