I was unable to find any sites that provided anything more than basic information on Varlam Shalamov. But, here are a few that are related.

RUSSIAN LITERATURE:
-Bucknell's Russian Literature Page: http://www.bucknell.edu/departments/Russian/ruslit.html
-A page on Bulgakov's Master and Margarita.

-Lucy Robert's page on Russian Symbolism and Sologub: http://cweb.middlebury.edu/ru152a-s98/Shalamov/bio.html -Gentian Falstrom's Akhmatova page: http://www.middlebury.edu/ru152-s98/Akhmatova
-Julia Topalian's Erofeev page: http://cweb.middlebury.edu/ru152a-s98/Erofeev
-A page with lots of links to Solzhenitsyn sites.

Other Pages:

-An interesting, slightly odd page on Russian prison tatoos.

-A really interesting page on Kolyma.

-Buy Kolyma Tales here.