In anticipation of our Excel practice, I’ve found some online Excel tutorial material that you can look at before you come in or use for reference after the fact.
Here is the beginning of a youtube excel tutorial that is pretty good. (The first part is good, anyway)
This is an About.com tutorial. Seems fine, but I haven’t looked at it too deeply.
Microsoft’s actual support and tutorial page is here.
If anyone has useful Excel reference material, post it in the comments.