Scott Adams mentioned a few simple rules for conversing with people in his recent book: 

• Ask questions.
• Don't complain (much).
• Don't talk about boring experiences (TV show, meal, dream, etc.).
• Don't dominate the conversation. Let others talk.
• Don't get stuck on a topic. Keep moving.
• Planning is useful but it isn't conversation.
• Keep the sad stories short, especially medical stories.

He was talking about starting conversations with people you don't know at public functions and parties and whatnot, but I think the idea applies to really any conversation.  I was involved (unwillingly) in a conversation yesterday where a person broke more than half of those rules in the course of a few minutes.  I wanted to stab my eyes out with a fork just to change the topic.