Read Superman: Red Son last night.

Quite enjoyed it. For anyone looking for balls to the wall action scenes you won't really find that here. I think you could call it more of an experimental tale, as Mark Millar takes the Superman mythos and turns it upside down, with well known characters being presented in a completely new way.
Though there are still some underlying themes that will always remain an integral part of any Superman story, and they are swiftly ingrained in the story, albeit in a very unique and original way.
Quick summary, basically Superman lands in the Ukraine as opposed to Kansas. He's brought up in Communist USSR, raised as a protege to Josef Stalin, and presented to the world as the new Russian super-weapon.
However, he's still Superman, and ultimately still holds humanity as his responsibility to protect, political affiliations aside.
Lex Luthor is there, but is married to Louis Lane. He remains as Superman's main opponent but not how you would expect.
Other characters such as Batman, Wonder Woman and Braniac also make an appearance.
Long story short, great story. You'll never see the ending coming.