From the Adobe Labs site:
“Adobe® Flash® Catalyst is a new professional interaction design tool for rapidly creating application interfaces and interactive content without coding. These can range from interactive Ads, product guides and design portfolios to user interfaces for applications. Flash Catalyst enables designers to start from static compositions created in Adobe Photoshop® CS4, Illustrator® CS4, or Adobe Fireworks® CS4 and convert the artwork into applications and interactive content. The designer does this by visually defining events, transitions and motion. Flash Catalyst can output a finished Flash SWF or AIR application that’s ready to publish on the web. In addition designers can provide the project file to developers who can use Adobe Flex® Builder™ to add additional functionality such as connection to back-end systems.”
This actually looks pretty cool! Unfortunately, there is no preview available for download yet (and at the time of writing, only an OSX version exists).