THE FASTBALL
There is an excerpt from the new Bill James and Rob Neyer book The Neyer/James Guide to Pitchers on ESPN.com right now (article here).

The excerpt is about the best fastballs ever, and also gives a little history on the pitch. It often gets lost in the mix, but the located fastball is the best pitch in baseball. Always has been, always will be. If you can hit your spots with a fastball you can go a long way in baseball, even if you don't have overwhelming velocity. There are guys like DOUG DAVIS in Milwaukee and of course JAMIE MOYER in Seattle that live at 83-86mph with their fastballs and have been pretty successful, and at least successful enough to GET to the Major League Level. Both Moyer and Davis feature a cutter, which runs in on right-handed batters, thus making the fastball seem faster because it has the ability to jam right-handers, but nevertheless, you'll see Moyer and Davis get big league hitters out with their straight 84 mph heaters.

It is somewhat of a myth that all big league pitchers throw 90+ mph. Even if you watch the radar gun at a ballpark or on tv that isn't entirely accurate. I've sat behind homeplate with advanced scouts and their radar guns are consistently 2-3 mph slower than the stadium or tv guns. Why the difference? It's entertainment. People like seeing the radar gun read 95mph instead of 92mph or 90mph instead of 87mph.