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Remember struggling to visualize three dimensional models when you were taking chemistry classes? Remember the old Tinker-Toy-like build-a-molecule kits? If so, wait until you see how the chemical world visualizes molecules now! The emerging standard for molecular visualization on the web is Chime, which has a free viewer available from http://www.mdlchime.com/chime/
A nice Chime tutorial is available online at http://c4.cabrillo.cc.ca.us/projects/chime_tutorial/html/index.htm
Once you have the plug-in installed and understand the basics of working with Chime, check out some websites which use Chime to visualize chemical molecules, proteins, etc., such as:
http://www.dcu.ie/~chemist/pratt/pdb/gallery.htm
http://www.umass.edu/microbio/chime/
http://cactus.nci.nih.gov/ncidb2/
http://molbio.info.nih.gov/cgi-bin/pdb
http://www.wellesley.edu/Chemistry/Flick/molecules/newlist.html
Or see some "Molecule of the Month" web sites such as:
http://www.bris.ac.uk/Depts/Chemistry/MOTM/motm.htm
http://www.chem.ox.ac.uk/mom/
http://www.ch.ic.ac.uk/motm/
http://www.phc.vcu.edu/feature/index.html