October 11, 2009
Britain's Central Planning Death Panels
October 11, 2009
Free Market M.D.
October 11, 2009
Economies of Scale in Compliance
October 11, 2009
Balan's Challenge
October 10, 2009
The Pleasure of Telling Others What to Do
October 10, 2009
Gonick the Great - and How He Could Have Been Greater
October 9, 2009
More Scott Sumner
October 9, 2009
Not From The Onion
October 9, 2009
Thoughts on a Second Stimulus


No idea either, but there are feeds for individual NBER programs.
And the link to the feed for all new working papers isn't on the page itself, naturally: you have to view the page's metadata or look in your browser's detected list of such feeds.
It's rather odd, really. Perhaps it's a work-in-progress and Google's spider just picked it up early.
Sounds like an answer to "You might be an econ geek if..."
Many thanks, Arnold! Very cool.
new.xml seems to be an aggregate of all the individual feeds
The feeds aren't new, but as david suggests appear to be a work in progress, as they aren't advertised and only recently are a lot of papers added.