I'll second the Charlie Francis site. Every time I'm in those forums I get more amazed. There are some really really knowledgable people and coaches there. I feel like I can learn something every time I click. They handle all things speed, jumping, and throwing along with weight training, periodization, and assistance for other sports (i.e. football where sprint and vertical are important performance criteria). If you are serious about increasing your vertical that's likely the best forum I've found to send you to.