Recently I wrote an article on Windows Installer Xml (WiX for short). Windows Installer Xml is an open source initiative from Microsoft for a toolset that builds Windows installation packages from XML source code.
I have written an introduction article on this technology that just got published in the Software Developer Network Magazine of november. You can read the article here. (You must be a member to read the complete article.)
If you got excited after reading about WiX, you can download the latest version from sourceforge.net.