I just found out about this app after reading this thread. It just kept crashing for me, so I had a look at the code and took the liberty of adding some code to stop the crashes (try/catch stuff in MediaCenter.py), and now it works fairly smooth for me. I've uploaded a deb with the fixes, in case anyone's interested. It has a sleek ui, and portrait support is a big plus. WIth a bit of polishing, I think it would be a nice replacement for the stock media player.