it's pretty much impossible to to fairly because you can buy your own tickets and also rig the results (not saying you will) but....
By letting trusted escrow members pick a winner from a randomized list removes me from the equation of picking the winner.
By buying my own ticket I increase the risk of not being chosen as a winner reducing the number of real tickets sold and making a loss.
I could upload a password protected zip file of the participants names thats date stamped to file hosting site. Then Theymos for example could pick a number between 1 and 100 and everyone is welcome to download that file after I post the password to see who won?
Unless someone can think of a better way of doing it.
Who is the escrow? I am kind of interested in this raffle, but not really interested in putting my bitcoins away for a month.