WiX tutorial
http://www.tramontana.co.hu/wix/

Introducing WiX
http://www.ondotnet.com/pub/a/dotnet/2004/04/19/wix.html

WiX Tutorial - Steps to Create an Installer MSI with WiX
http://www.dalun.com/wix/01.09.2005.htm

Windows Installer Guide from Microsoft MSDN

http://msdn.microsoft.com/library/en-us/msi/setup/windows_installer_guide.asp

General WiX Documentation and Help