Staten Island Yankees pitcher Pat Venditte is able to pitch with either hand (quite well in fact). In last night's game [June 19] against the Brooklyn Cyclones, Venditte faced the first two batters of the ninth as a right-handed pitcher. Then, switch-hitting Ralph Henriquez came to the plate to bat from the left side. Venditte switched his custom-made, six-finger glove to his right hand and prepared to pitch lefty. Henriquez then turned around to bat right-handed. The two players switched sides several times before umpires stepped in to discuss the issue. ...SNY video of the final two batters is here.
The Sporting News has some background and the New York Times wrote about Venditte back in April 2007.