At the heart of the Sun, 400 trillion trillion trillion hydrogen nuclei fuse into helium every second, releasing more energy than humans have used since the beginning of civilization.

http://fusedweb.pppl.gov
Princeton Plasma Physics Laboratory: This site features eight ways to learn about fusion energy.

http://FusionEd.gat.com/
Great Atomics Fusion Group: You will find a fusion slide show and teacher resources on the electromagnetic spectrum.

http://fusedweb.pppl.gov/CPEP/Chart_pages/2.TwoFusionReactions.html
Two Fusion Reactions: Terrific graphic and an explanation of the fusion reaction.

http://www.chemicalelements.com
Chemical Elements: Good site for middle school students for information on the Periodic Table of Elements.

http://www.chem4kids.com/index.html
Chem4kids: A great site for students to learn about the periodic table, atoms, and chemical reactions.