I spent some time today looking again at the state of quantum computing: I'm still not worried.
The D-Wave system is not a general-purpose quantum computer; it is pretty specialized for solving certain problems (I'm reasonably certain cracking ECDSA encryption is not one of the problems it would be good at, but I am definitely NOT a quantum crypto expert).
Skimming the research, it looks like you'd need a specially-constructed quantum computer with 515 qbits and over 100million quantum gates, running more than 16 million quantum operations to crack Bitcoin's 256-bit ECDSA private keys using Shor's algorithm.
There's was a good reality-check article in the New York Times just last week:
http://www.nytimes.com/2011/12/06/science/scott-aaronson-quantum-computing-promises-new-insights.html
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I've said it before: I'll start to worry when quantum computers can factor 64-bit numbers.