Building further on my post about .NET, I got an e-mail from Red Five Labs about their beta release of CF for Symbian (named Net60). This company has already run a CTP of the same product without much attention from the community. Considering the operating system market shares for smartphones, this could open up a new market for .NET developers building mobile applications. It also give the traditional Symbian developer a chance to work with a great development tool (Visual Studio) and a great framework (CF).
Of course, there's much more to building applications that has the right UX than just the framework, but it opens up the possibility to write some of the code (logic, etc) that can run on most of the devices on the market. I will try to get some time to play with it, and blog more, and if you check it out, please let me know what you think...