I just typed a long post on this, and for some reason, it didn't show up.
Bruce Springsteen was signing as he left an event. I saw him sign a Born to Run album, which not only is a classic album...lots of white space so the signature would show up nicely.
Howard Stern, who often walks while he signs, is in LA with his wife. She's doing lots of shows promoting her new book on dogs.
And John Travolta, always one of the best signers in Hollywood...was talking about planes with fans and signing up a storm.