If you use managed code, and you care about performance, then we want to hear from you. We have not yet shipped the next version (what we call Version 4) of the .NET Runtime, however we are 'locked down' enough that at least a few of us on the runtime...

In case anyone is interested I did an video interview on the runtime in general. This is more about philosophy than technology, but if you are in the mood for some philosophy about the runtime, here is some from someone who has been around from the CLR...