Structure Databases:

PDB (Protein Data Bank): http://www.rcsb.org/pdb/

BMRB (Bio Mag Res Bank): http://www.bmrb.wisc.edu/

Journal Articles:

PubMed: http://www.ncbi.nlm.nih.gov/sites/entrez?db=PubMed

Biochemistry online journals: http://www.library.arizona.edu/search/subjects/chemistry/biochemjour.html

Structure Visualization:

DeepView site: http://www.expasy.ch/spdbv/

DeepView tutorial: http://www.usm.maine.edu/~rhodes/SPVTut/index.html

Major structural classification websites:

SCOP: http://scop.mrc-lmb.cam.ac.uk/scop

CATH: http://www.biochem.ucl.ac.uk/bsm/cath

DALI/FSSP: http://www2.embl-ebi.ac.uk/dali