Awesome
dot-net-coverage
A .net coverage tool originally introduced on CodeProject that works by instrumenting the assemblies in a separate step, rather than by injecting at load time using profiling APIs
For a while, this was about the only tool that reliably worked on .net 4, 64 bit, so I've salvaged it from GoogleCode as a historical document.
My own re-implementation and expansion of this concept is here at SteveGilham/altcover