I have. We scanned the top 30 results for nearly 30,000 of the top keywords (provided by WordTracker, everything from paris hilton to homes for sale in ohio) and there were definitely some people who knew what they were doing getting sites less than a year old to rank. This was done about 6-8 months ago when it was much less common knowledge that there was ways around the sandbox. It was just about the best research we could have possibly done as far as learning about ranking "new" sites in today's Google.