An excellent scan of the front page of this site courtesy of Hannah and as signed by:

Lorne Michaels
Ana Gasteyer
Horatio Sanz (twice)
Tracy Morgan
    Jimmy Fallon
Chris Kattan (twice)
Molly Shannon
Will Ferrell

...following the filming of these episodes:

1-9-99 Bill Paxton and Beck
2-6-99 Gwyneth Paltrow and Bare Naked Ladies
Drew Barrymore and Garbage