Other Favorite Productivity Sites

From Productiveprogrammer

PragMACtic-OSXer Site maintained by a bunch of passionate Mac power users (including Neal). Great tips and tricks: basically, every time one of use finds something cool, we blog about it here.

LifeHacker Great general productivity site, with a wide ranging set of topics across operating systems, disciplines, and everything else.

43 Folders Another great public site, a little more focused on hard-core knowledge workers but still very broad in coverage.