Most available interviews with the author focus on Ghost or his subsequent book on the history of the movement to abolish slavery, Bury the Chains, however the internet still serves up this 1994 piece from the Progressive and in this interview from 2005 he answers some general questions on what he reads and how he writes. For the latest from Hochschild, check out this very recent New York Review of Books piece: Rape of the Congo (with accompanying podcast).
There are several online exhibitions on the Soviet gulags and you can spend much time just browsing photographs:
George Mason University Gulag: Many Days, Many Lives and Gulag: Soviet Forced Labor Camps and the Struggle for Freedom).For a glimpse at how Russians are still processing the Stalin era be sure to check out this NYT article: Re-Stalinization of a Moscow Subway Station.
Open Society Gulag: Forced Labor Camps
The New York Public Library NYPL Digital Gallery
A website for a film GULAG 113 that has some multimedia extras
Finally, this site from a survivor: KOLYMA: The Land of Gold and Death