Ben Langhinrichs has put out a call for help putting the "better support for legacy office documents" argument to bed.  Specifically, he is looking for any documents that won't open in either Office 2007 or OpenOffice/ODF Editors.  Even better, he would love to find the mythical document that opens in Office 2007 but won't open in an ODF Editor.  If you have run across such a document in your daily routine, please help out and send the document to him.