http://nobelprize.org/medicine/educational/2001/cellcycle.html

All kinds of exciting and interesting interactives on cells:

http://www.biology.arizona.edu/cell_bio/cell_bio.html

If you have Flash, you're going to love this comparison of mitosis and meiosis!

http://www.pbs.org/wgbh/nova/baby/divi_flash.html

DNA interactive:

http://www.pbs.org/wgbh/aso/tryit/dna/#

Interactive overview of DNA & RNA processes:

http://www-class.unl.edu/biochem/gp2/m_biology/animation/gene/gene_a1.html

Transcription in more depth:

http://www-class.unl.edu/biochem/gp2/m_biology/animation/gene/gene_a2.html

Translation in more depth:

http://www-class.unl.edu/biochem/gp2/m_biology/animation/gene/gene_a3.html

More transcription practice:

http://gslc.genetics.utah.edu/units/basics/transcribe/

The "Blue People" story: 

http://www.mc.uky.edu/ahec/skyahec/methem-CE.htm

Blood typing interactive:

http://anthro.palomar.edu/blood

A great introduction to basic Mendelian genetics:

http://www.genetics.gsk.com/kids/heredity01.htm

A great tutorial on genetics:

http://sps.k12.ar.us/massengale/genetics%20tutorial.htm

Looking for a gene?  Go here and search the chromosomes!

www.ornl.gov/hgmis/posters/chromosome

DNA:  The instruction manual of life

http://www.thetech.org/exhibits_events/online/genome/index.html

Finally, gel electrophoresis online!

http://www.tvdsb.on.ca/westmin/science/sbioac/genetics/Electro.htm

Geologic time scale online:

http://www.ucmp.berkeley.edu/education/explorations/tours/geotime/index.html

Fossil web:

http://www.ucmp.berkeley.edu/education/explorations/tours/fossil/9to12/intro.html

The Mating Game:  This is hysterically fun!

http://www.pbs.org/wgbh/evolution/sex/mating/index.html

How plants grow...  great interactive:

http://www.fw.vt.edu/dendro/forestbiology/cambium2_no_scene_1.swf

The Inner Body website...  covers all the major systems!

http://www.innerbody.com/htm/body.html