Adobe has released an update to Flex 4 SDK as well as to the Flash Builder 4.
These are the list of bug fixed in Flex SDk 4.1 by the Flex team and Flash Builder 4.01 Update.
It has been added minor enhancements to the SDK such as the Flex mirroring and bidirectional text.
The Flash Player 10.1 and AIR 2 runtimes are now supported by the updater.
You can download the Flex 4.1 SDK manually or you can use the update system of Flash Builder 4 to update the IDE and the SDK automatically.

Flash Builder 4 delivers a long list of new features, plus improvements to many existing features.There are three main themes to this release: developer productivity, designer-developer workflow, and data-centric application development, more…
Adobe® Flash® Catalyst™ is a new professional interaction design tool for rapidly creating user interfaces without coding.
- Transform artwork created in Adobe Photoshop® and Adobe Illustrator® into functional user interfaces.
- Create interactive prototypes with the ability to leverage them in the final product
- Publish a finished project as a SWF file ready for distribution
- Work more efficiently with developers who use Adobe Flash Builder™ 4 to create rich Internet applications (RIAs). Designers use Flash Catalyst to create the functional user experience then provide the project file to developers who use Flash Builder to add functionality and integrate with servers and services, more…

Flash Builder 4 delivers a long list of new features, plus improvements to many existing features.There are three main themes to this release: developer productivity, designer-developer workflow, and data-centric application development, more…
Adobe® Flash® Catalyst™ is a new professional interaction design tool for rapidly creating user interfaces without coding.
- Transform artwork created in Adobe Photoshop® and Adobe Illustrator® into functional user interfaces.
- Create interactive prototypes with the ability to leverage them in the final product
- Publish a finished project as a SWF file ready for distribution
- Work more efficiently with developers who use Adobe Flash Builder™ 4 to create rich Internet applications (RIAs). Designers use Flash Catalyst to create the functional user experience then provide the project file to developers who use Flash Builder to add functionality and integrate with servers and services, more…
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Flash Builder 4 delivers a long list of new features, plus improvements to many existing features.There are three main themes to this release: developer productivity, designer-developer workflow, and data-centric application development, more…
Adobe® Flash® Catalyst™ is a new professional interaction design tool for rapidly creating user interfaces without coding.
- Transform artwork created in Adobe Photoshop® and Adobe Illustrator® into functional user interfaces.
- Create interactive prototypes with the ability to leverage them in the final product
- Publish a finished project as a SWF file ready for distribution
- Work more efficiently with developers who use Adobe Flash Builder™ 4 to create rich Internet applications (RIAs). Designers use Flash Catalyst to create the functional user experience then provide the project file to developers who use Flash Builder to add functionality and integrate with servers and services, more…