Mobile Developer's Video Tutorials channel is full of videos that will help you learn to create apps for Nokia smartphones. Currently my focus is on Qt and Symbian.
Be sure to visit my YouTube channel
http://www.youtube.com/user/MobileDevVT/videos
It has been a while since my last post. My app Speed Gauge is now available for the Windows Phone platform. This means that Video Tutorials explaining how to Develop app like this are coming soon.