(This may have been posted already...but) There is a lot of cool pitch location data here by Josh Kalk, not only for pitchers but also for batters. (Not to deny your great f/x graphs, Xanthan.) My quick impression of a few Giants players:
Randy Messenger seems to hang a lot of curves and sliders, while the change-up seems to break too far in or down to be effective.
Lincecum has nice location on his change-up. Lowry used to have a great change-up. Now it seems from this graph that about a third are hanging up over the plate. Also, the release point on his slider drops down a little - could be tipping batters off. Likewise, Correia seems to drop the slot down a couple inches on his change-up.
Check out how many of Zito's curves have a 15-17 inch drop. But quite a few hangers there too.
On the batting side, look how effective a sinker, split, or cut-fastball was against Barry last year. Ortmeier was swinging at too many high pitches and couldn't hit a slider. But he picks up the change very well.