Good post on running/writing/compiling managed binaries as 32-bit or 64-bit
How the OS Loader will force .Net v1.0/1.1 executables to run under WOW64 on a 64-Bit Machine (https://blogs.msdn.com/joshwil/archive/2004/10/15/243019.aspx)
In General I think all of Josh's recent posts are worth a read.
--Grant