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"... Who can recommend good books/articles on negotiation? ..."

Negotiation is as much about non-verbal as it is verbal. So what's a good way to learn negotiation aside from watching "Lie to me" ~ http://en.wikipedia.org/wiki/Lie_to_Me or "Hustle" ~ http://en.wikipedia.org/wiki/Hustle_(TV_series) ? What about playing and learning poker?

In any sort of negotiation it helps if you can understand a) where the person you are negotiating with is coming from and b) what they are really thinking.This is where playing poker can help. To win you sometimes have to bluff (or lie) about your hand. People who are superior at understand and reading what others are thinking can use this to their advantage so try some books on psychology. A good start is understanding "cognitive bias" (how individual psychology can influence individual decisions) ~ http://psychology.wikia.com/wiki/Cognitive_bias

Another good reference ~ http://en.wikipedia.org/wiki/Paul_Ekman