I am a bit late to the conversation, but apparently Mosfilm has made Solaris available online:

Part 1:

http://www.youtube.com/watch?v=GG9Anstjlro&feature=youtu.be

Part 2:

http://youtu.be/yOGHMmKpASk

(Links are from:

http://www.openculture.com/2010/07/tarkovksy.html

there are more Tarkovsky film links there).

Word of warning: do not expect Star Wars or Inception type special effects. And this is Tarksovky's reading which, if you know Tarkovsky, he was concerned more about the human condition, than technological aspects of Sci-Fi.