I also follow @Wossy (Jonathan Ross, UK comedian/entertainer).

Both of these update frequently and give a good glipse into the life a celeb.

There’s a whole list on http://www.celebritytweet.com/

@ Al Gore
@ Alex Albrecht
@ Alison Sudol
@ Amber Benson
@ Andy Murray
@ Anita Cochran
@ Arnold Schwarzenegger
@ Ashton Kutcher
@ Barack Obama
@ Ben Kweller
@ Bishop Alan Wilson
@ Bjork
@ Bob Guiney
@ Bob Vila
@ Borat Sagdiyev
@ Brea Grant
@ Brent Spiner
@ Brett Gurewitz
@ Britney Spears
@ Brooke Burke
@ Brooke Hogan
@ Cesar Millan
@ Chris Carrabba
@ Chris Cornell
@ Crispin Glover
@ Dane Cook
@ Dave Matthews
@ David Blue
@ David Hewlett
@ David Lawrence
@ David Lynch
@ Demi Lovato
@ Demi Moore
@ Diablo Cody
@ Don Draper
@ Doug Benson
@ Dr. Drew Pinsky
@ Eli Manning
@ Elijah Wood
@ Emma Watson
@ Erykah Badu
@ Evan Williams
@ Ewan McGregor
@ Felicia Day
@ Fran Drescher
@ Fred Durst
@ Gail O’Grady
@ Gerard Way
@ Greg Grunberg
@ Imogen Heap
@ Ingrid Michaelson
@ James Gunn
@ James Kyson Lee
@ Jamie Kennedy
@ Jamie Murray
@ Jane Fonda
@ Janina Gavankar
@ Jason Mraz
@ Jemaine Clement
@ Jerry Rice
@ Jesse Jane
@ Jhonen Vasquez
@ Jimmy Fallon
@ Joe Biden
@ John Cabrera
@ John Cleese
@ John Edwards
@ John Hodgman
@ John Mayer
@ John McCain
@ Jona Bechtolt (Yacht)
@ Jonathan Coulton
@ Jonathan Ross
@ Justine Bateman
@ Karl Rove
@ Kate Hewlett
@ Kathy Griffin
@ Katy Perry
@ Keiko Agena
@ Kerry Rhodes
@ Kevin Rose
@ Kevin Smith
@ Lance Armstrong
@ Larry David
@ Leo Laporte
@ LeVar Burton
@ Lily Allen
@ Lisa Loeb
@ Luke Wilson
@ Mariah Carey
@ Martha Stewart
@ Maxime Verhagen
@ MC Hammer
@ Michael Ian Black
@ Michael Phelps
@ Michael Urie
@ Mikey Way
@ Mischa Barton
@ Nastia Liukin
@ Natalie Gulbis
@ Neil Gaiman
@ Olivia Munn
@ Patrick Wilson
@ Paul Brandt
@ Paulo Coelho
@ Penn Jillette
@ Perez Hilton
@ Pete Wentz
@ Pete Yorn
@ Phillip Schofield
@ QTip
@ Questo of the Roots
@ Rachel Bilson
@ Rainn Wilson
@ Richard Branson
@ Rivers Cuomo
@ Robby Gordon
@ Robert Llewellyn
@ Robin Williams
@ Russell Brand
@ Ryan Adams
@ Ryan Newman
@ Ryan Seacrest
@ Sara Bareilles
@ Sarah Palin
@ Sean P. Diddy Combs
@ Sebastian Bach
@ Shaquille O’Neal
@ Shaun White
@ Snoop Dogg
@ Solange Knowles
@ Soleil Moon Frye
@ Sophia Bush
@ Stephen Colbert
@ Stephen Fry
@ Steve Jobs
@ Steve Nash
@ Steve Wozniak
@ Summer Glau
@ Taylor Swift
@ Terra Naomi
@ Tina Fey
@ Tom Waits
@ Trent Reznor
@ Vanessa Hudgens
@ Walt Mossberg
@ Wil Wheaton
@ William Shatner
@ XZIBIT

(You can also check who the celebs follow – because they don’t follow many – from Jimmy Kimmel, there was Dane Cook, Adam Sandler, and several others).