Flash Animation 7: Let's Move, Baby.

Finish it by doing the forearm and hand on the next arm. Remember that generally we tend to be dominant with one hand while gesturing and speaking, so the other arm and hand don't really need to be so animated. You'll see my joints around the wrists look a little odd. This is just a side effect of my own personal style, which leans towards characters with freakishly long limbs and exaggerated proportions.

Remember, this is a quick run-through, so it's not going to be perfect. Doing this for anything other than instructional purposes would take far longer and take far more time, tweaking, and finesse. Also remember that your SWF previews are going to look much smoother and better than these low-quality animated GIFs.