I've had an article on component skinning in the works for several months but finally got it done and its now published on the Adobe Developer Center. The article walks you through the different options for skinning components in the Flash CS3 authoring environment: manually editing the assets, code-based skinning and talks about how you can package up your skinned component as an SWC to easily share it with the rest of your team.

http://www.adobe.com/devnet/flash/articles/skinning_flash_cs3.html

Enjoy!

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AuthorPeter