When my Flex Builder trial was coming to expiration and it was time to install my purchased license. Much to my chagrin, the Flex license manager (Eclipse > Help > Manage Flex Licenses) wouldn't accept my license with a confusing display: the checkbox was green indicating the serial was valid, but the message was "Serial number is invalid" and I could only close.

I want to write more about my recent experiences with WebORB for .NET, an amf remoting solution to integrate Flex with .NET, but that'll have to wait until I complete this project.  

Because they are letting Rob Conery spend most all of his time educating us on MVC, TDD, mocking, scalable architecture, Linq, the (his) repository pattern, pipes and filters, IQueryable, dependency injection, and plenty more for FREE to you and me.