Can't really manage it since I'm still in the process of reading Marx but: a community to give a leftist analysis of the macroeconomy. Also serve as a community to discuss modern trends in the field along with their issues (neoclassical and Keynesian). Maybe call it /political_economy instead of /economics
Whatever the many problems with neoclassical economics, it still is necessary for the socialist movement to have a hard understanding of the economy and how to change it. Political economy, in that sense, is still important