It's been about a year since the release of Visio 2007 and Office 2007, and Microsoft has now published Service Pack 1. Here is the download link for English. You can choose another language from this link as well. http://www.microsoft.com/downloads/details.aspx?FamilyId=496BC7C1-ABD7-4BC7-8366-B8A4CC85803B&displaylang=en
