I don't think many people uses Mono but I was eager to see how GACing works on linux, and came though this link: http://www.mono-project.com/Assemblies_and_the_GAC
It gives good overview on discovering and loading assembly.
Less number of developers have prevented me developing GACBrowser in Linux. Hopefully some hardcore Mono guy (sorry! gender no bar) will do when time is right.
My next venture is a small .NET software to mass compress of images with couple of guys. We are going to port that into Windows as well as Unix like systems. It will use MVP (Model View Presenter) pattern so that we can reuse most of my code. Target audience is bigger and so we can afford to do so.