I've been diving into the Symbian platform lately. I already worked with it in some minor MIDP (Java) projects but the last few weeks have been filled with reading trough the documentation and checking out the example programs. Its interesting to see how Symbian has tweaked the C++ language quite a bit with strict naming conventions that are necessary for the compiler so that he knows what he ought to do. There is it's own kind of exception handling, etc. When you have finally compiled a program then you need to go trough a expensive and lengthy signing process in order to make the file distributable. 

All this makes mShell so cool because it gives anyone from kickass programmer to the beginner access to many Symbian features, leaving out the whole complicated developing process. We see people using it as a prototyping tool or implementing one of the many little programs that just gives you the feature your handheld computer is missing. But we also used mShell for quite sophisticated projects like distributed BT dispensers, where people could come up to a terminal, turn BT on and receive free content or other programmers that have taken it quite far like a full blown ICQ client or an FTP program.