WOW TheScarletPimpernel!  
 
 
That is some list you have there!  
 
 
I never thought of collecting playbills. It's only recently that I thought to start. A friend of mine that has been collecting for some time was explaining to me that is only way to get those actors that never sign otherwise, like Morgan Freeman, Denzel Washington etc. And it's so true! I managed to get Alicia Silverstone and Ethan Hawke that way. I also sent both of them a regular request and neither of them signed my photos, but they both signed my program.  {thumb2} 
My list is very short, but I am excited about what I have so far. It's too bad the London plays don't send out cast signed programs. I was hoping to get some really hard signers. 
Here is my short little list so far. These are all cast signed playbills:
Time Stands Still   
        Alicia Silverstone
        Anna Gunn
        Robin Thomas
        David Harbour
The Cherry Orchard  
        Ethan Hawke
Impressionism       
        Jeremy Irons
        Marsh Mason
        Joan Allen                         
        Michael T. Weiss  etc.
Blithe Spirit       
        Angela Lansbury
        Rupert Everett etc.
Exit the King        
         Susan Sarandon
         Geoffrey Rush etc.
God of Carnage     
         James Gandolfini
         Jeff Daniels etc.