I would like to know that too, but my understanding is that short interest is only released once a month, around the 20th of the month or so. The exchanges consider it proprietary information, and only the specialists and market markers have that info real time. (Another one of their many little edges over the general trading public.) But I hope I am wrong and someone does have a source of real time short interest info. The best I've got is the company profile on Yahoo financial. Anyone got something better than that?