I had a hard time choosing between UT, LJ, and xoB. Finally went with Bruce for the simple fact that he bought my CD.
That, and he displays a good balance of whimsy and outrage, each at their appropriate time. And there's the dodad thread, of course.
It's kind of a big tie between about 7 people, actually. Tough call. elspode, wolf, all of you are entertaining and/or infuriating in your own way.