But be careful about how much you trust any bitcoin service. Bitcoinica, another margin trading platform, was wildly popular but existed for only 6 months; they had to shut down after several hacks and people lost funds.
Also, the main way to get non-bitcoin funds into these kinds of services is via mtgox redeemable codes, but those won't be available anymore after the 10th of April because of legal concerns.
But be careful about how much you trust any bitcoin service. Bitcoinica, another margin trading platform, was wildly popular but existed for only 6 months; they had to shut down after several hacks and people lost funds.
Also, the main way to get non-bitcoin funds into these kinds of services is via mtgox redeemable codes, but those won't be available anymore after the 10th of April because of legal concerns.