Amazing DNA by Bert Hubert.
Ben Wagner's Biology courses and more.
Biochemistry Medical Pages by Dr. Michael W. King, cached here. All credits to Dr. King.
Biology Pages by Dr. John W. Kimball, cached here. Any donation links go to Dr. Kimball, since it's his info.
Math Atlas by Dave Rusin.
Metabolism by Bert Hubert.
Neal Stephenson, In the Beginning was the Command Line.