Rakki Muthukumar is a Microsoft Developer Support Engineer for ASP.NET and IIS7. If you haven't seen his blog, he has a bunch of really great tips about IIS7. This one in particular explain how to run 32-bit and 64-bit applications on the same IIS7 box, but in different worker processes. This was not possible in IIS6, so it's a welcome change for developers looking to run legacy 32-bit apps while upgrading their projects to 64-bit.