Here is a list of some new features from Adobe.com’s site,:
Adobe Photoshop and Illustrator import
Import Adobe Photoshop® (PSD) and Adobe Illustrator® (AI) files, while preserving layers and structure, and then edit them in Flash CS3 Professional. Optimize and customize the files during import with advanced options.
Convert animation to ActionScript
Instantly convert timeline animations into ActionScript™ 3.0 code that can be easily edited, reused, and leveraged by developers. Copy animations from one object to another.
Enjoy a new, streamlined interface that emphasizes consistency with other Adobe Creative Suite 3 applications and can be customized to improve workflow and maximize stage space.
ActionScript 3.0 development
Save time with the new ActionScript 3.0 language, featuring improved performance, increased flexibility, and more intuitive and structured development.
Test content with a powerful, new ActionScript debugger that offers greater flexibility and user feedback, as well as consistency with Adobe Flex™ Builder™ 2 debugging.
Adobe Device Central
Design, preview, and test mobile device content using Adobe Device Central CS3, now integrated throughout Adobe Creative Suite 3. Create and test interactive applications and interfaces viewable with Flash Lite™ software.
Rich drawing capabilities
Visually adjust shape properties on the stage with smart shape drawing tools, create precise vector illustrations with the new Pen tool inspired by Adobe Illustrator, paste illustrations from Illustrator CS3 into Flash CS3 Professional, and more.
User interface components
Create interactive content with new, lightweight, easily skinnable interface components for ActionScript 3.0. Visually modify components’ look and feel with the drawing tools — no coding required.
Advanced QuickTime export
Render content published in a SWF file as a QuickTime video using the advanced QuickTime exporter. Export content that includes nested MovieClips, content generated with ActionScript language, and runtime effects such as drop shadow and blur.
Sophisticated video tools
Create, edit, and deploy streaming and progressive-download FLV content with comprehensive video support. Ensure the best video experience with a standalone video encoder, alpha channel support, a high-quality video codec, embedded cue points, video import support, QuickTime import, closed captioning, and much more.
Timesaving coding tools
Save coding time with new code editor enhancements. Focus on relevant code with code collapse and commenting, and jump to code errors with the error navigation feature.