Dropbox.Update a file inside the dropbox folder and it automatically updates on their site, with the same link and everything. Pretty cool.
Google drive also does this, as well as Box Sync, Microsoft Skydrive, Ubuntu One, and Jolicloud.
none of you are answering his question.he wants a site to reupload a file to another location on its own? at least thats how hes wording it.hes not asking where and how to host a file, then manually post a link to it somewhere lol