I am having a great time with the new FLASH CS4 BONE TOOL , here is an animation project started a while ago & I was waiting for the incredible new animation features of Flash Cs4 to bring it to life ,these are a few pictures  showing how the bones are applied and some animated test video of the character in action. A full bone tutorial will be on FLASHARTIST.ORG very soon. In the meantime all I can say is that Flash animators will enjoy this new version of Flash more than the previous updates for all these new features.