Download the Windows kernel source code!
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While doing a little bit of research into key loggers for work (don't worry - I'm looking at CardSpace), I came across a site that offered the Windows kernel as a source code download. Interesting, but probably dodgy as they come.
Turns out, it's legit. Microsoft have released the Windows Research Kernel as Shared Source. Check out the page, it contains loads of the core parts of the kernel OS, including thread scheduling and memory management. Pretty cool, huh? Perhaps Scott Hanselman should look at this for his next Weekly Source Code.
There's just the small issue of the licensing requiring academic affiliation, so you're not likely to get your hands on it here.