Right now I've been enjoying the quality of writing (as well as value of the content) on http://www.meltingasphalt.com/; it's a mix of philosophy, psychology, econ, and tech (with various other stuff sprinkled in).

Probably my favorite post from there: UX and the Civilizing Process http://www.meltingasphalt.com/ux-and-the-civilizing-process/