Running IIS7 in 32-bit mode

Very interesting article about running 32-bit and 64-bit ASP.NET versions at the same time on different worker processes

http://blogs.msdn.com/b/rakkimk/archive/2007/11/03/iis7-running-32-bit-and-64-bit-asp-net-versions-at-the-same-time-on-different-worker-processes.aspx