Geek Glue is geeking out on the Flex Integration in Fireworks CS3. As they are creating additional components to the standard shipping set, I noticed some good trial and error tips. These posts are a good read on Geek Glue:
Fireworks CS3 : Creating Flex Symbols
FFC : LinkButton – Tidying Up
Fireworks Flex Components : Extended
Fireworks Flex Components : Label
There are also some great articles on Flex/Fw in the Fireworks Developer Center as well.