I'm starting to really think what is the use of discussing who's a choker and who isn't.
Take Tendulkar for example. He's been accused of being a choker since 2002 by certain people. What about the World Cup then? India started horribly, but Sachin was consistent throughout, and played a significant part in India's making it to the final.
So what if Ponting fails while chasing? Is he the only one who has to chase? He's helped Australia thrash opponents by setting huge totals. The fact that even if he can't chase under pressure, but can set up big totals, even in pressure matches, should be even to have people stop complaining.