Are there any production-ready distributed caching mechanisms like memcached that can be used in a Windows 64-bit environment? From what I've seen, memcached is run on linux machines in production environments, however I don't have control over the fact that we will be using 64-bit Windows machines.
Additional requirements include for any suggested solutions:
I know some of the guys in my office evaluated NCache and the results were reasonably good.
Have a look at SharedCache- free, open source, and 100% managed code. Works great on 64bit, and we use it for a large site (10's of thousands of users).
Memcached runs on Windows, but we don't have the packaging solid yet. A good client has been available for a while.
The Velocity Framework (http://community.bartdesmet.net/blogs/bart/archive/2008/06/30/a-lap-around-microsoft-quot-velocity-quot-cache-it-now.aspx) is Microsoft's solution to a memcached-like framework for .NET