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If you don’t think enterprises understand Flex, check out the new Yahoo! Messenger for the Web. This beta uses a combination of Flex and PHP to render the messenger as an RIA.

After announcing they would share the source for the Actionscript engine, Adobe has announced they will also Open Source Flex and Apollo technologies. With Flex becoming the center of the Adobe development universe, it makes you wonder with whom Adobe is preparing to compete?

If you’re still questioning the power of Apollo Applications, check out what Grant Skinner is developing. gTimer is an Apollo Time Tracking Application, which was developed in Flex, deployed via Apollo and will run on Windows and Mac.

If you doubt the impact, and believe that Adobe Apollo is dead on arrival, then you should check out what the gang at Cerulean Studios did with a couple days and the Apollo alpha.

The “A” in RIA stands for application, which many people forget when trying to apply good usability practices. This article defending Flex touches on the fact that usability for Web sites should not be applied to Web applications.