If you haven’t developed Windows Phone applications yet, Brian has posted some resources for getting started.
I’ve gotten the Windows Phone App fever. The past few days I’ve been creating my first Silverlight applications for Windows Phone and I have to say I’m impressed with the development environment and the emulator. I’ve done a lot a work with Windows CE and Windows Mobile in the past, so I've seen my fair share of device emulators, and the Windows Phone emulator is very nice and easy to use.