Must-click link: Anatomy of a pitch
Here are some awesome videos and infographics breaking down baseball's basic pitches, and some others that are a little more specialized.
Here's a fun little series of infographics. With the help of some Diamondbacks' pitchers, ESPN put together a look at baseball's various pitches, specifically fastballs, changeups, sliders, curveballs, and split-fingers. Three different fastballs (four-seamer, two-seamer, sinker) are discussed.
Each pitch comes with a video and some stat graphics, and in the video the pitchers discuss their pitching motions in detail. Balance points, when they break their hands, all that stuff. They also discuss grips, how they snap their wrists, stuff like that. Here's the link again. Check it out, pretty neat stuff.