Crystallography courses on the web

1. X-ray Crystallography in 5401 seconds (Manfred S. Weiss): http://www.embl-hamburg.de/~msweiss/teach (A very short and simple introduction)
2. The book of Fourier (Kevin Cowtan): http://www.ysbl.york.ac.uk/~cowtan/fourier/fourier.html (Nice explanation of what is important in a Fourier calculation)
3. The physical meaning of the phase in crystallography (Stanley C. Nyburg): http://www.ccp14.ac.uk/maths/nyburg/ (A Classic in Crystallographic Teaching)
4. Crystallography 101 (Bernhard Rupp): http://ruppweb.dyndns.org/Xray/101index.html (Very good and nice introduction, some interactive parts)
5. Crystallographic Tutorials (Michael R. Sawaya): http://www.doe-mbi.ucla.edu/%7Esawaya/tutorials/tutorials.html (good for beginners, somewhat outdated when it comes to programs)
6. Basic Maths for Protein Crystallographers (Eleanor Dodson): http://www.ysbl.york.ac.uk/~mgwt/CCP4/EJD/bmg/index.html (If you want to work in protein crystallography, here are the math essentials)
7. The Molecular Level - Tools for Structural Biology Education and Training (Gale Rhodes): http://spdbv.vital-it.ch/TheMolecularLevel/index.html (from the author of "Crystallography Made Crystal Clear" - website includes a Glossary of Terms from Crystallography, NMR, and Homology Modeling)
8. Macromolecular Crystallography course at Cambridge Institute of Medical Research - 6 basic lectures (available as HTML) and 17 advanced topics (10 of which are available as HTML)

Movies

1. Crystallographic movies (James Holton): http://bl831.als.lbl.gov/~jamesh/movies/ (Very illustrative movies on the effects of resolution, R-factor data completeness etc. on the information content of the structure).
2. http://www.ruppweb.org/level1/movies_list.htm
3. 17 minutes about structural biology
4. MIT OpenCourseWare
5. http://ocw.mit.edu/OcwWeb/Materials-Science-and-Engineering/3-60Fall-2005/CourseHome/ The instructor is Prof. Bernhardt Wuensch (materials science).

other

1. what do the features in electron density maps mean? see Dale Tronrud's explanations at [1]