After a long wait the newest version of the Adobe Flex IDE has been released in beta. Flex Builder is now called Flash Builder 4 and boasts several new features, mainly:
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designer/developer workflow
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data-centric development
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IDE productivity and testing
You can read about all of the new features and download the beta at http://labs.adobe.com/technologies/flashbuilder4/.Alongside Flash Builder 4, Adobe has released Flash Catalyst (formerly code-named "Thermo") to beta as well which promises to increase the productivity and speed of rich internet application development without coding. Flash Catalyst provides the user with the means to turn standard Photoshop and Illustrator artwork into actual interfaces!!! Now THAT'S entertainment! Somebody bring me some cookies cause I'm gonna be here for awhile!
A couple of must read articles:
Differences between Flex 3 SDK and Flex 4 SDK beta by Joan Lafferty
Whats New in Flex 4 SDK Beta by Matt Chotin
What's New in Flash Builder 4 Beta by Tim Buntel
And some videos!!! These are presented by Adobe to provide tutorials and training in the Flash Platform. Best of all, they are free!
Videos Here