1000 ft/lb reverse impact WOULD do the trick, but most people can't afford the impact and required size air compressor (or may not have the SPACE needed for that compressor)
I bought a crank pulley holder. Schley 64300:
http://www.amazon.com/Harmonic-Damp..._1?ie=UTF8&s=automotive&qid=1284233328&sr=8-1
Thread the two screws into the female threaded spots on the crank pulley (they do thread in, you just need to work at em), attach breaker bar and 19mm socket to crank pulley bolt, attach breaker bar to pulley holder.
Brace the breaker bar against something (I used frame rail), and give the bar a fairly good yank (may have to work at that for a while too). It WILL come free.
Replace the crank pulley bolt with a new one while you're at it.
Since I've replaced everything there, I can take apart the front of the engine (all timing belt components) in under 20 minutes with the radiator IN the car