There’s really only one web comic I read anymore: xkcd. Randall Munroe continues to turn out thoughtful gems, and I really appreciate the ad-free nature of the site. I also find his What-If? series delightful; the first episode is one of my favorite interweb jewels!
But it’s his insight to the human condition and ability to nail a point with such brilliant brevity that I most relish. I value some of his comics as highly as I value favorite quotes; both are pithy petards against our myths and illusions.
And sometimes he even hoists my petard a bit!