Ted Patrick has been working on a search-engine that would allow us to search different Adobe Flex knowledge-bases (blogs, flexcoders, livedocs, Adobe-Devnet etc) from one place. He has just posted about the search-engine. I would rather let you read his post than rewriting everything here.
Interestingly,this search-engine is developed using Adobe Flex 2.0 and Coldfusion. The source-code is available which would allow you to customize search-engine front-end. I believe, it can be useful for companies who have Adobe Flex development going on and public internet-access is not allowed to employees, yeah there are many such companies 🙂