I think the hacker/coding/programming element of this site makes the rest of the discussion whether on business management or leadership all the more interesting. If you are a hacker and also interested in business it's hard to find a replacement. There are plenty of business sites / magazines without technical people on them of course.
I don't have a suggestion for an aggregator but ...
I find Harvard Business Review to be my best source of management and leadership article, both the books they publish and the quarterly magazine.
Another source I like is Software Lead Weekly mailing list.
Good idea! HN is a valuable source for management.