OK, I was wondered about this. After I had read The Brief History of time, I thought I would be a good idea to write Sir Hawking an e-mail/letter/whatever. Than I realised, what an absurd idea that was. However, it makes me wonder if the top physicists get and fanmail. I didn't know where to put this question, it didn't seem right to put it to physics, so I put it here. Hopfully some physicist-star is going to look at this thread :).