I'm looking around for an iDisk replacement and SugarSync seems to the the one that best mimics iDisk. Others like DropBox are similar, yet different, for example when you toss a file in iDisk it copies it, not moves it. When you toss a file to Dropbox it moves the file to the folder rather than copying it. I like the redundancy of having an offline and online copy. Also cost is a factor, and SugarSync offers 30GB for $50, which is about what I paid for MobileMe. I don't need 30GB, 15GB would be more than fine if there was a similar less expensive service though.