Here are some useful links for your searching pleasure:
Protein Data Bank - the single worldwide repository for the processing and distribution of 3-D structure data of large molecules of proteins and nucleic acids.
Berman, H. M., D. S. Goodsell, and P. E. Bourne. "Protein Structures: From Famine to Feast." American Scientist 90 (2002): 350-359. (PDF)
Publication on PDB Growth
Swiss PDB Viewer (Deepview)
Other Free Visualization Programs (free for academic use):
Jonathan King Lab Homepage - Professor Jonathan King's laboratory research answers questions about protein folding, protein misfolding, virus assembly, computational biology and we are investigating proteins from photosynthetic prokaryotes.
Protein Folding Groups List - A list of research groups interested in protein folding (updated frequently).
The Basics of Making Cheese - Overview of the basic components of cheese and the process of making cheese.