There is a new german webSite: http://www.schnittke.de.
Walter Fischer is collecting information and news around the music of Alfred Schnittke.
You will find interesting articles there, and there are many links to terterian.org.
Walter Fischer created a wonderful banner for Avet Terterian, which I am proud to use here. Have a look at www.schnittke.de, you will find english texts there, too.
P.S. 2013: this website is still alive, but not maintained anymore, unfortunately.