As usual, Glenn Greenwald covers in a more comprehensive way many of the points I'd love to hit. He starts by pointing out that in most current conservative circles, one can no longer be a "conservative" if one dissents with the Bush administration. He moves on to discuss the consistently violent streak of many prominent "conservative" voices. Not surprisingly, these two traits are of a piece.
UPDATE: Apparently, Glenn's gotten a great deal of conservative reaction to the post I linked! Here's his response.