Possible Clues:

• Carson Daly's former MTV show
• Show formerly hosted by Carson Daly, for short
• Carson Daly's old MTV show, for short
• Bygone daily MTV series, informally
• MTV countdown program
• Site of many a video premiere
• MTV show where fan girls go "squeee!" over celebs
• MTV afternoon staple
• MTV's longest-running live show
• MTV series