A handy reference guide for Microsoft PowerPoint is available from itbusinessedge.com.

PowerPoint Quick Reference Card
The guide includes an introduction to the basics of PowerPoint, a list of useful PowerPoint keyboard shortcuts and tips on using formatting, graphics and animations in your presentation.
It’s probably most useful for new users of PowerPoint and those who have just upgraded to PowerPoint 2007. It’s free! So download it, print it out on both sides of a piece of paper and if you have a laminator handy you have just got yourself a reference guide that won’t stain when you put your coffee mug on top!
Here’s where you can get the reference guide: http://www.itbusinessedge.com/cm/docs/DOC-1342 (registration required). Guides for other Office products and Abobe products are also available.