It's been a while since I've seen a new pitch introduced in baseball. Now, Daisuke Matsuzaka (aka "Dice-K"), a recent Japanese import for the Boston Red Sox has introduced American baseball to "The Gyroball." He's apparently one of the few players who can throw the pitch well enough to strike out professional hitters. Because of the arm motion required to get the proper spin, most pitchers can't throw it fast enough to get it by hitters. Apparently "Dice-K" is a rare talent.
For a complete scientific look at the pitch check out Bill Nye's article and to see it in action watch the video below. Very cool. Also, for a great guide to pitching check out "The Complete Pitcher."