Adobe Systems announced plans to release source code for Flex as open source. The open source Flex SDK and documentation will be available under the Mozilla Public License (MPL). Probably under the pressure of Microsoft Silverlight? I have only played with Flex 2 and half years ago when we were evaluating various RIA technology, and was very impressed with it. However due to not being an open source product, we pretty much discarded it straight away and went with OpenLaszlo instead (but then the project did not eventuate). Either way, both are way better than all these Ajax crap we have on our browsers today.