IMO, posing is one of the most CRUCIAL elements in a Flash production. It's our only defence against stiff looking movement and helps us to get as close as possible to traditional looking animation.
Above you'll see how we've taken the rough board panel and posed out the characters to match the action. You can also see how the artist has referenced where she's used "re-use" elements already drawn in previous poses. This is done to avoid the same elements (hands facial expressions etc.) going through the pipeline over and over again. It also helps to keep the characters "on model".