Bioman Biology is a site I just found out about from my wife, who teaches Biology. The site was created by a Biology teacher and has games and virtual labs that teach students concepts in Biology. It is standards based, interactive, and free.
There are games, simulations and virtual labs for the following areas: Body Systems (Physiology), Cells, Ecology, Evolution, Classification, Genetics, Meiosis, Life Chemistry, Respiration, Photosynthesis and Scientific Methods.
There are also quizzes for each area available and a teacher section to help teachers use the site to it's fullest.
The activities are fun and educational.
More Biology Resources: http://educationaltechnologyguy.blogspot.com/search/label/biology
