Flex seems to be on the right track, offering a powerful environment that will allow the developer to build either Flash applications, and in the future, full Ajax applications. The IDE is based on Eclipse, which is already very popular and is open source. Flex adds support for syntax completion, an integrated compiler and a realtime debugger that will save a lot of the common pain with debugging web applications.
Bill McCoy, GM of Adobe’s ePublishing Business, has an overview of the announcement on his blog. Adobe also launched Flex.org yesterday, a new resource for Flex developers.