Cam: "When Johnny Carson decided to leave the Tonight Show, we started seeing all kinds of regular guest hosts....I'm guessing that Letterman is following Johnny's example, starting with a couple of guest hosts this week." Hmmm, I thought there were guest hosts this week because it might not make sense to jump back into work full-time after a quintuple bypass surgery. Though, Cam may be right about the retirement thing. Major life decisions often happen after dramatic events like Dave's.