Monad
My tech interests are all over the map, but my current job is Windows system administration. That's why I find Microsoft's MSH project so interesting. Also known as Monad, it's Microsoft's attempt to provide a robust command shell that can be used for all system administration, not just what Microsoft has deigned to write a command-line tool for or what you've written a hideous VBScript or JScript for.
I haven't tried it out myself yet, but just browsing through some of the examples, I'm worried they've gone way overboard in trying to create an entirely new paradigm for command shells while at the same time munging in a bunch of half-complete syntax appropriations from Unix script languages. On the other hand, maybe it's time to try something new in the command line world. If I get around to really experimenting with it, I'll report back.