I currently have E-mail alerts when content is added or moddified, but people can ignore this and then claim not to have see it. Is there a way in Sharepoint or by a third party bolt-on that I can get a small popup to appear on everyone's screen on the domain that they have to manually close to inform them of new content. Hope you can help, thanks in advance.

Hi, Please look at the Public Folder Watcher. Perhaps, it that what you need. http://www.artfulbits.com/Products/PublicFolderWatcher.aspx - Yura