Ken Mardle provided this reference:

Amazing site devoted to everything you ever wanted to know about proteins.

The graphics on molecular structure are stunning and there are generally
multiple formats including VRML, JPEG movies, stills from SEM's and X-ray
crystallography, rendered 3d models, and more.

For a taste check out the molecule of the month:

http://www.rcsb.org/pdb/

For collagen look at:

http://www.rcsb.org/pdb/molecules/pdb4_1.html

(the good stuff is in a link off the second page (PDB file lbkv).

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