This is one of my favourites from the 1980s: The Day of the Triffids. I loved the book and I think they did a really fine job with the adaptation. They don't make a great effort to get you to suspend your disbelief, so you'll have to do that yourself, but once you do that, it turns out to be much more rewarding than if they had used gimmicks like music or weird shots to get you there.
http://www.youtube.com/show/dayofthetriffids
If you're a fan of The Good, The Bad and The Ugly, that's up as well, in fact, linked from the front page, but I only really like the music about it. Anyway there are a few films and television shows on YouTube now, so as this is a forum, feel free to discuss.
Full films and shows on YouTube
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