Flex Development

Flex, its an IDE provided by Adobe to develop future web applications, rather rich internet applications. so far Flex 1.0, 2.0 and 3.o are already released. Next version the Flex 4 is in development stage. The main feature of flex is that its open source, rich look and feel and quick response. The development work is made easier by providing a large set of freely available custom components. A nice presentation about Flex 4 can be viewed here :

Flex 4 SDK next plan by Matt Chotin
Flex 4 SDK presentation in PDF