I love how Mr. New Vegas says; "Stay classy, New Vegas." after some of his broadcasts. To anyone who doesn't know, it's a reference to the movie 'Anchorman', where Ron Burgundy (Will Ferrel) says; "Stay classy, San Diego." after every news broadcast.
Actually, Anchorman references the original "Mr. Vegas" with that quote ;P
Also, the H&H Tool e-mails are, hands down, the funniest texts in the entire game.