Structure of Fluid Lipid Bilayers
http://blanco.biomol.uci.edu/Bilayer_Struc.html
The structure of fluid bilayers. A clear and chemically oriented introduction to the bilayer concept.
Membrane Transport
http://www.wiley.com/legacy/college/boyer/0470003790/animations/membrane_transport/membrane_transport.htm
Easy-to-follow animations of diffusion, facilitated diffusion, and active transport.
Ion Channels
http://www.ionchannels.org/
Home page for ion channels, with emphasis on drug development.
Diffusion, Osmosis, and the Nernst Equation
http://physioweb.med.uvm.edu/diffusion/
Excellent lab simulations of diffusion, osmosis, and ion transport.
Endocytosis
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/Endocytosis.html
Overview with many examples of endocytosis, including receptor-mediated endocyotsis of LDL.