I don't think that the other file-sharing sites, like Rapidshare, filesonic, hotfile, etc..., have anything to worry about since they actively remove copyrighted content. Megaupload never implemented any significant measures to remove copyrighted files. This is why the Justice Department went after them. I'm sad to see megaupload go. They were easily the best web based file-host. They had the fastest download speeds for free users, no wait times between downloads, and best of all they did not police their content. I'm not very optimistic that they'll be back.