David Letterman is the king of Late Night TV. On the air now for 21 years, apporching 10 years as host of the "Late Show" on CBS. Leno is no match to Letterman, nor is Jimmy Kimmel on ABC. I feel like the "Late Show" has more class then other late night talk shows, though you might think not it at times. When Dave retires he will leave BIG shoes to fill.