Not sure if I posted this one already.
Microsoft has created a whole host of on-line training courses for all of their Office products. This one is for Office 2003:
http://office.microsoft.com/en-us/training/CR061958171033.aspx It has two pages of courses starting off with the basics and going into more advanced topics. Each lesson is about 20 to 30 minutes long. You will even get some practice sessions during a lesson.
On the left side of the page will be links to the other products, including Office 2007.
