WWW.ACEPIXS.COM . . . . .....April 23 2007, New York City....Brian Williams arriving at 'The Late Show with David Letterman' at the Ed Sulivan Theatre in midtown Manhattan... ....Please byline: Kristin Callahan - ACEPIXS.COM..... *** ***..Ace Pictures, Inc: ..Philip Vaughan (646) 769 0430..e-mail: info@acepixs.com..web: http://www.acepixs.com