WiX 64bit

32- and 64-Bit Installations, WiX 3.5 - Topics of the Week 5
http://msmvps.com/blogs/installsite/archive/2011/02/07/32-and-64-bit-installations-wix-3-5-topics-of-the-week-5.aspx

How to target 32bit and 64bit a .NET applications with WiX and separate MSI packages

http://insomniacgeek.com/how-to-target-32bit-and-64bit-a-net-applications-with-wix-and-separate-msi-packages

WiX Memo

http://blog.makotokw.com/memo/wix/

Beginner’s Guide to Windows Installer XML (WiX)

http://www.slideshare.net/alekdavis/beginners-guide-to-windows