And There Was Much Rejoicing: Office Migration Planning Manager

For people who wanted to convert all their MS Office documents to the ECMA OpenXML file format *soon to be ISO ratified* in a batch process, this download will speed up your organization's migration. IT'S FREE!! like beer!

Don't worry, it wont modify your orginal binary files, it will just create new XML equivalents in a separate folder. There is no downside, unless you think files that take up half the size is bad. *yay*