Via Sriram:

Yup - this is THE Matt Pietrek (of Numega and those amazingly complex MSDN articles fame) who has started blogging. With Raymond Chen and this guy together in the blogging world, you can be sure to read some high-quality stuff

Now this was definitely a good way to start a Friday. Matt's "Under The Hood" articles transformed my knowledge of the way Win32 apps worked in much the same way as Chris Brumme's blog has helped my understanding of the CLR.