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Evolution of Stars
Simple explanation of birth, life, and death of stars.
http://www.milky-way.com/
Starclock: Stellar Evolution Software
Starclock is a program for DOS that animates the evolution of stars on the HR diagram.
http://leo.astronomy.cz/sclock/sclock.html
Stars Beyond Maturity
The evolution of stars beyond the main sequence explained in detail.
http://www.arm.ac.uk/~csj/astnow.html
Stellar Evolution
Stars and the Hertzprung-Russell diagram (where a star's absolute luminosity is plotted against its surface temperature).
http://www.astunit.com/tutorials/stellar.htm
Stellar Evolution (a la Chez Stella)
The Universe in the Classroom: Basic school lesson introducing stellar evolution metaphorically through a restaurant setting.
http://www.aspsky.org/education/tnl/49/chezstella.html
Stellar Evolution and Death
The NASA Observatorium's presentation on stellar evolution and extinction of stars.
http://observe.arc.nasa.gov/nasa/space/stellardeath/stellardeath_intro.html
The Life and Death of Stars
A detailed look at the evolution of stars from birth to death.
http://www.rog.nmm.ac.uk/education/lectures/evolution/index.html