Chemistry --
X-Ray Crystallography Links
http://www-structure.llnl.gov/Xray/101index.html
This is a web site that explains x-ray crystallography and what is is used for. It also contains information on equipment that is used in x-ray crystallography, as well as step by step equations that are used in the calculations of data. This is an excellent web site for beginners, and contains valuable step by step tutorials.
http://crystal.uah.edu/~carter/protein/xray.htm
This is a page dedicated to X-ray crystallography and how is it performed. You can find resources on x-ray diffraction and how it is used.
http://geology.csupomona.edu/drjessey/class/gsc215/minnotes7.htm
http://www.hwi.buffalo.edu/ACA/
http://onsager.bd.psu.edu/~jircitano/chm435.html