Check out my presentation on "WCE Internals" (based on WCEv1.1) available at slideshare (posted by RootedCON):
I'll publish the .pdf on http://www.ampliasecurity.com/research/ next week.
You can find all the RootedCON 2011 presentations here:
Some presos are in Spanish and some in English.
Go check them out!