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This site is about Microsoft Windows internals and, as its content will grow with time, it will feature both tools and technical articles. If you are interested in peering under the hood of your OS, then you may find something of interest here.
Recent updates
June 2009
A new article on IRP completion is available, which explains why IRPs have to be completed just so. It comes with a test driver complete with source code.
May 2009
A new article on APCs in Windows Vista is available, featuring an in-depth analysis of how APCs work. A test driver complete with source code is provided as well, to see APCs at work.
September 2008
A test filter driver for Windows XP and Vista is available in the Tools Section. It allows to trace IRPs and data for I/O requests sent to a given device. The driver source code is included with the download.

The fully functional version of the Footsteps tool can now be downloaded for free from the Tools Section.