For general powershell, yes like PSGet.
There is 3 differentes Packages Managers for Powershell, but no one them based on nuget package structure.
http://psget.net (the same but not the same project)
I think it will be very nice nuget supports powershell modules too.
there is chocolatey project an application manager, this projects seem to be very nice, they are using the same structure of nuget packages and even the same site layout.... wow!!!
what is your point on view: the projects should be unified or not?