While doing some brain dumping for my old job I happened upon an excellent resource for Windows internals type information.
Microsoftie Calvin Hsia's blog has a number of posts related to topics like Memory Handles and Very Advanced Debugging tips. Don't let the references to Visual Fox Pro keep you away, alot of the information is relevant for Windows in general.
Currently listening to: Esta Noche Voy a Verla - (02:24)
Pablo Montero, Que Voy A Hacer Sin Ti