Microsoft have a set of Office 2007 posters available for free for schools.
Details can be found on the Microsoft Blog: blogs.msdn.com/ukschools/archive/2008/06/17/free-office-2007-classroom-posters.aspx
If you’d like me to send you a set, just email with your name, school name and address. Let them know if you’re already using Office 2007 in the classroom, or if you’re rolling it out this summer, and then they will get them in the post ASAP. (If you just can’t wait, and you want to download the PDFs, then click here to get them from SkyDrive)