These sites are highly recommended:
the site of the E. J. Boys Archives, the most complete archive in the world on the men of the Light Brigade
The Crimean War Research Society
the website of the international research society dedicated to the study of the Crimean War
David Kelsey's site containing transcriptions of a large number of source documents to aid the researcher
The Charge of the Light Brigade: the 13th at Balaclava
a site containing excerpts and pictures from Barrett's History of the 13th Hussars
Whistle-world visits the Crimean War
a site primarily about Fanny Duberly and Captain Louis Nolan --- with downloadable copies of their books
Yahoo Groups: Crimean War Discussion Group
an international discussion group with online discussions on all topics Crimean
Mark Conrad's Homepage -- Russian Military History
a page containing a large number of translations of articles from the original Russian sources
John Barham's Crimean War site with a multitude of articles on a variety of subjects related to the war
http://www.batteryb.com/crimean_war/index2.html
First Sergeant Scott Gutzke's pages related to numerous aspects of the Crimean War