Based on the 1907 'malyj' Brockhaus-Efron Encyclopedic Dictionary, this resource allows complex searches of what is more an encyclopedia than dictionary. It contains histories of cities, battles, biographies of historical figures antedating the year of publication. A wonderful resource of information on little-known (or well-known) figures, events and places of Russian history.

As you learn the grammar from the On-line Russian Reference Grammar, you should build your vocabulary. Here is the perfect place to begin.

This dictionary includes an IPA pronunciation guide for the English, accented syllables for the Russian, and a frame filled with synonyms, so it functions as a thesaurus, too. Unfortunately, the results of a search provides too many definitions, many of which are wildly wrong. It functions better from English to Russian than vice versa. Best for professionals who know the language well.

Elvis is alive and well in Moscow. He is a web server with one of the best on-line Russian-English-Russian dictionaries.

An excellent electronic English-Russian-English dictionary by the Moscow Institute of Physics and Technology. Any Cyrillic codepage works.

Don't fret if the link above should vanish; here is a list of its many mirror sites.

A specialized dictionary which may be useful.