About.com: Valentina Tereshkova: Biography of the first woman in space.
Russian Space: Soviet and Russian space history and biographies.
Sergei Korolev: Information about the Soviet chief designer and pioneer in rocket design, Russian launch vehicles and other designers.
The Soviet Manned Lunar Program: The evolution of the plan to land cosmonauts on the moon, with references.
The Straight Dope: Are There Really "Lost Cosmonauts" Stranded in Space?: In April 1965, Reader's Digest told of Cosmonauts stranded in orbit. This article addresses some of the mystery behind the Soviet space program failures.
VideoCosmos: Images of Soviet space history, and a list of all cosmonauts trained in the USSR and Russia.
Virtual Space Museum: An online multimedia museum devoted to the Russian space program. Includes timelines and 3D spacecraft models in VRML.
Why the Soviets Never Beat the U.S. to the Moon: A Soviet space expert discusses how recently declassified material confirms his painstaking discoveries over decades about why the Soviet Union was unable to win the space race.