memcached is an open source caching technology behind xanga, a massive online community site (numbering in millions). Now it has a .NETframework client binding.

 

"The memcached server and clients work together to implement one global cache across as many machines as you have. In fact, it's recommended you run both web nodes (which are typically memory-lite and CPU-hungry) and memcached processes (which are memory-hungry and CPU-lite) on the same machines. This way you'll save network ports."