to me even creating proprietary client and apis for synching files and folders seems like making things needlessly complicated, when you can use rsync ad sftp (and fuse and sshfs) all of which rely on rock solid open standards. but I understand that Dropbox became so popular because it made files and folders synching accessible to everyone who could already use files and folders. as simple as that. in this perspective Receivd (I too think that the name sucks) could be a winner