Economists Tyler Cowen and Alex Tabarrock maintain one of the most engaging economics blogs on the web called the Marginal Revolution. It's interesting in and of its own right, and its posts on the current policy response to the recession and financial services regulations are well worth browsing.
Among the posts and discussion threads of particular interest on the debate over federal economic policy are:
A debate on the effects of fiscal stimulus, with a focus on Paul Krugman's arguments, that can be found here.
An vigorous exchange with Brad DeLong on monetary versus fiscal stimulus here.