You may have seen this linked elsewhere already, but I’m putting it here for future reference.
Canaan Partners is a first-class venture capital firm, and they’ve assembled a “how to” document for entrepreneurs coming in to pitch. They explain very clearly what they’re looking for in a first meeting, and you should pay attention. It applies to any early-stage VC or angel investor.
Click on the full-screen icon (next to last on the bottom of the image).