I caught the finale of Stage 4 of the Giro d'Italia on the webcast. The apparent winner of the stage Paolo Bettini of Quickstep was relegated to fourth place because the race commisars concluded that he was careless in his bike handling during a sprint with Francaise des Jeux rider Baden Cooke. Cooke tried to come around to Bettini's left and crashed against the barriers rather spectacularly.
As a result of the referees' decision, Luca Mazzanti of Ceramica Panaria was declared the stage winner, with Bettini retaining the General Classification lead.
VeloNews has a more detailed summary of the stage, including a good photo sequence of the crash taken by Franck Fife.