Is there any way to short bitcoin with current exchange technology?
You can sell BTC/USD futures contracts on ICBIT.se, with leverage up to 10X
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http://www.ICBIT.seAnother form of shorting bitcoins is to buy PUT options on MPOE. Or the trading methods offered through 1Broker provide a way to go short.
None of those are offered from a financial institution in the U.S. That might cause some to see the counterparty risk as being unacceptably high.
CoinSetter could be the first U.S.-based organization to offer methods to go short. Kraken is another. Neither is open to the public yet.
There are other methods coming as well.
When they arrive, they will be added to the list here:
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http://en.bitcoin.it/wiki/Trade#Financial