PowerPoint Tutorials:

http://www.actden.com/pp/ 

(recommended by Microsoft- great tutorial for beginners that is printable)

http://www.orst.edu/instruction/ed596/ppoint/pphome.htm  

(click on "PowerPoint Basics Slide Show" for great basic rules on slide presentations---good "buttons" description also)

http://www.ac.wwu.edu/~cii/powerpoint/presentation/index.htm

(lots of good tips on presentation techniques)

http://www.education-world.com/a_tech/tech013.shtml

(PowerPoint tutorial from Education World)

http://www.techtrainteam.com/services/olt/office97/ppt97.html

(very nice PowerPoint 97 tutorial for beginners)

http://north.gp.k12.mi.us/Tips/PptTutorial/index.html

(nice section on how to animate slides)

http://www.iupui.edu/~webtrain/tutorials/powerpoint2000_basics.html

(PowerPoint 2000 basics tutorial)