You know those people who nod a lot in meetings, appearing interested even when they are either bored to death or have no idea what the hell is being said? Sarah Cooper has "9 Nodding Strategies for Your Next Meeting."
Above: The Slow Nod Followed by a Fast Nod
The slow nod followed by a fast nod is great to let the person talking know that you didn't get it at first, but you totally get it now, even if you still don't agree.
Below: Let Me Write That Down Nod
This is the nod you use when you're pretending to write that down.