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Developer Connection: Flex Video Training (Adobe Flex in a Week)
Create your first Facebook application with Flex
Flex 开发入门
Flex Developer Center: 针对具体开发场景的大量示例代码和文章.
Flex 3 Developer's Guide：很好的 Flex 基础知识入门材料.

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Adobe Flex 3
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• Flex Builder 3 Professional (Flex Builder 3.0.2)
• Adobe® Flex® Builder 3 Professional Eclipse Plug-in (60 day trial)