WinCE

Here are links to some really good and informational videos, hosted in microsoft channel.
For me, they were really helpful in building up the basic of the windows ce system architecture.

http://channel9.msdn.com/posts/TravisHobrla/Porting-Drivers-to-Windows-CE-60/

http://channel9.msdn.com/posts/Rory/Windows-CE-Windows-XP-Embedded-and-Windows-Mobile-Explained/

http://channel9.msdn.com/posts/Charles/Bor-Ming-Hsieh-and-Sue-Loh-3rd-Generation-Kernel-for-Windows-CE/

http://channel9.msdn.com/posts/Charles/Juggs-Ravalia--Windows-CE-60-Device-Driver-Model/