Kevin,

>Is anyone aware of examples of companies who are actually running .NET Web apps in production? There is a fear in our company that we'd be developing in an environment where no one else is actually running apps, and therefore we're venturing into an unknown. So obviously, I wanted to be able to point to specific examples where .NET is in use, particular in situations where large numbers of users are hitting it.

Being gentlemanly and all that, I'll point you to a competing magazine. :-)

.NET Magazine from Fawcette (not Windows and .NET Mag) is running some case studies in almost every issue. Here is an example:

http://www.fawcette.com/dotnetmag/2002_04/magazine/columns/casestudies/jsalas/

However, I cannot vouch for the quality... just that they are there. (I didn't read them yet).