Are there any active Bitcoin leveraged trading platforms available? For awhile Bitcoinica was a very popular leveraged trading service, but it got hacked and closed down. Are there any more services like that still functioning in the Bitcoin ecosystem?
https://icbit.se/ offers trading of futures instruments, in particular BTCUSD-12.12 (BUZ2) which enables leveraged BTC trading. However, user orders are matched only against other users (it does not utilize liquidity from larger exchanges such as Mt. Gox), and the way it works is not very intuitive.