My proof-of-concept source code is now online in HTML format as well. Start here:

http://www.pretentiousname.com/misc/W7E_Source/Win7Elevate_Inject.cpp.html

I also converted the step-by-step guide in the readme into HTML:

http://www.pretentiousname.com/misc/W7E_Source/win7_uac_poc_details.html

Now you don't have to download the source zip or have Visual Studio to see how simple it all is.