This may be the biggest time-waster I’ve seen in the past month.
MLB tracks all pitchers using something called PITCHf/x. If you need a primer on PITCHf/x, then you’ll probably want to read up on this, but in short it’s a system for tracking pitches much more comprehensively than they’ve ever been tracked in the past.
Josh Kalk has put together a tool called the PITCHf/x Tool, and it lets you plot graphs on any major league pitcher, in any imaginable situation. It’s very cool, though there’s a bit of a learning curve, which is why I suggest going to the primer I linked above and reading up on the system before trying the tool for yourself.
(hat tip goes to Jason Kottke)