There was a recent contest with PowerPivot, see the details of the contest here: http://www.exceleratorsquiz.com/challenge.html
There were some great PowerPivot reports submitted, including some from our MVPs: Bill Jelen created a â€œTag Cloud & SmartArt Updated Via PowerPivot!â€ report:
Tushar Mehta created a â€œVisualize US population trends over the last 150 yearsâ€ report:
Update: Unfortunately the site with the entries is down, Iâ€™ll update this if we get another link to them.
â€¦And on a kind of similar note, if you havenâ€™t taken the Excelerator quiz yet, give it a go: