An extensive library of CE reversing tutorials. (http://www.ka0s.net)
Useful information on the ARM processor. (http://www.arm.com)
Background for learning ASM. (http://www.heyrick.co.uk/assembler/)
Download useful tools such as the MVT (http://www.microsoft.com/ windows /embedded/default.asp)
Detailed information on the CE kernel. (http://msdn.microsoft.com/library/en-us/wcekern/htm/_wcesdk_kernel_services.asp)
"Embedded reverse engineering," by Seth Fogie, Airscanner Corp. Paper presented at Defcon 11, August 2003.