I thoroughly enjoy Astronomy Cast and have managed to finally listen to all of the episodes and catch up to the present day.
The feed that I follow with my "pod-catching software" is http://feeds.feedburner.com/astronomycast. It as well as the http://www.astronomycast.com/ website only show episodes through #255 (as well as the 8 March Weekly Space Hangout). I can see on various G+ Streams that the Weekly Space Hangouts have continued as well as episodes through #257.
Is there a currently operating feed that serves more recent episodes and hangouts?