Make yourself as visible as possible - bright clothes, bright helmet. Be confident and assertive - and yes, I know how hard that can be. Ride vehicularly when it makes sense to do that - I'm no VC evangelist, but there are many times that it makes a lot of sense, particularly when you're confident about it. And of course be sure you're riding predictably - no turning left at a stop sign from the right edge of the pavement!

None of these are a panacea, of course. Drivers will still do stupid things - sometimes because the don't see you, sometimes because they can't wrap their minds around the fact that a cyclist could be going faster than walking speed, and sometimes because they want somebody on whom to take out their frustration, anger, or anti-social tendencies. It may surprise you, though, how much the level of stupid behavior goes down when you're visible, assertive, and predictable.

Some of it depends on where you're located, too. I generally have very few problems with drivers when I'm out cycling - for a long time I thought it was just due to my superb skills, but eventually I came to realize that drivers around here are just a lot nicer than they are in some places. But my superb skills don't hurt anything.