Are there any margin trading platforms for bitcoin that are still operating? I've heard about the Bitcoinica hack, but are there still margin trading sites operating today? (that hopefully has better security measures!)
On ICBit.se are BTC/USD futures contracts, with up to about 10X margin. On MPOE are CALL and PUT options contracts, which give leverage and buying on margin can be requested. A service called BitFinex is derived from Bitcoinica source code. 1Broker provides leverage.
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http://en.bitcoin.it/wiki/Trade#Financial[Edit: Don't discount the counterparty risk however. Do your research.]