Stay out of people's blind spots. rjacket touched on it.
Be aware when you're driving next to another vehicle in their blind spot or changing lanes into another driver's blind spot. This is especially true for merging traffic. They always talk up blind spots with semi trucks, but it's just as easy to get lost and pinched in any car's blind spot.
Speaking of merging, be confident in your merging. Pick your slot and accelerate into it. Trying to merge onto a 70 MPH freeway while maintaining 45 MPH looking for a slot is a recipe for disaster. There's no need to be too aggressive about it, but don't be a limp dishrag either.
If there is an open lane next to you and someone is trying to merge along side, change lanes. This will avoid the silly merging dance: You speed up, then they speed up. They slow down, and you slow down. Just change lanes, give them an open courtesy lane to merge into, and slide back after a few hundred feet.
Don't constantly tap your brakes. It's not hard to maintain a following distance using only the accelerator. If you feel you constantly have to tap the brakes to maintain a proper following, you're probably trying to go too fast or following too close.