Stuff like this is seen before, but now MS has made it really easy to use. Microsoft SharedView allows you to share documents and screen views with groups of other people. I think this could be a great tool for AX customers on remote sites. You can use it to show them how to do stuff in AX if they have particular questions and you can use it the other way if they have some AX issues you'd like to see them reproduce.
Here is a link to the download and more information: http://www.connect.microsoft.com/content/content.aspx?ContentID=6415&SiteID=94