I picked up a book at advance auto parts today... its a Haynes book, but specifically for "Sport Compact Performance". A TON of useful info for DIYers, as well as the filthy rich that can pay to have everything done. It covers pretty much anything dealing with the motor, and optimizing it for power and doing it all right. Even down to the drivetrain and making it look all pretty.

I definatly recomend it to anyone that wants more power, but dosent really know where to start... or what the options are. They have others ones as well, for other types of modifications. It was $25, but the whole book has color photos and alot of how-to information.