I can't believe that running stoplights/stop signs isn't on the list.
As well as:
Drivers who don't turn from the appropriate lane.
Drivers who signal the wrong direction when turning.
Drivers who get too close to the center stripe when oncoming traffic approaches.
Of course, some of these things happen *because* somebody is yakking on their cell but typically the yakkers are the ones driving too slow, weaving, not braking properly, not turning the car sharply or just behaving cluelessly while driving.
How about the guy who speeds up on the interstate just as you begin to pass him? ARGH!