I know that this sounds like an annoying plug or review (forgive me) but I just thought it was worth saying.
I just saw the new sci-fi film "Avatar" and I see a lot of parallels between this movie and Lewis' "Out of the Silent Planet". Specifically, the hero joins the mission at the last moment, gets chased away by a beast, gets stranded with the natives and learns about their culture. The cultures in both Avatar and OotSP are even similar (though in Avatar, it was more based in Native American beliefs). But the philosophies were similar.
There were even Westons and Devines in "Avatar". Two people, one focused on destroying the planet for money, and the other puts the human race above all the natives, using it as an excuse to rid the planet of them. While "Avatar" was focused more on the message of crass imperialism, I definitely saw a lot of the Malacandra in the film.
I'm sorry if this seemed like a bad rave, but I just wanted to offer this tidbit. Um...I guess if you liked "Out of the Silent Planet", you'll like "Avatar", but feel free to disagree.