Ok, this is one of my big pet peeves.
When shaking hands apply a firm pressure: I am not shaking your hand to test your grip strength, but at the same time, I do not want a limp fish in my hand. If your hand is clammy or sweaty for some reason, quickly wipe it on your pants before you shake my hand; with practice you can do this very discreetly. When you grasp my hand you want the web in between your thumb and first finger to meet with the web between my thumb and first finger; do not just grab my fingers.
For women: Everything above applies to you as well. Do not offer me only your fingers. Chances are very good that I am not going to kiss the top of your hand, so unless we are in a situation that absolutely dictates that the top of your hand needs to be kissed, offer up your whole hand for the shake. I promise that I am not going to try to crush your hand, but I do ask that you provide some sort of strength feedback during the shake.