Papers recommended by Sean Parkin  for you to read:

Macromolecular Cryocrystallography: Cooling, Mounting, Storage and Transportation of Crystals Sean Parkin and Haakon Hope

Flash-cooling and annealing of protein crystals S. Kriminski, C. L. Caylor, M. C. Nonato, K. D. Finkelstein, and R. E. Thorne  

Cool data: quantity AND quality, E. Garman

Macromolecular Cryocrystallography Garman and Schneider
 

And newer ones recommended by Dan Thiel:

Cryocooling and radiation damage in macromolecular crystallography, Garman and Owen, Acta Cryst (2006) D62, 32-47.

Quantifying X-ray radiation damage in protein crystals at cryogenic temperatures, J. Kmetko, N. S. Husseini, M. Naides, Y. Kalinin and R. E. Thorne, Acta Cryst. D 62, 1030-1038 (2006).

High-pressure cooling of protein crystals without cryoprotectants, C. U. Kim, R. Kapfer and S. M. Gruner, Acta Cryst (2005) D61, 881-890.

Hyperquenching for Protein Crystallography, M. Warkentin, V. Berejnov, and R. E. Thorne, J. Appl. Cryst. (2006) 39, 805-811.

A new sample mounting technique for room-temperature macromolecular crystallography, Y. Kalinin, J. Kmetko, A. Bartnik, A. Stewart, R. Gillilan, E. Lobkovsky and R. E. Thorne, J. Appl. Cryst. 38, 333-339 (2005).