There is a great website Guesslist that you can enter everyone's email address into, and dictate which people can't get each other (siblings, spouses, etc).... It then sends out an invite (like evite) and once everyone agrees to participate, it emails everyone their secret Santa! We used it this year for my family and it worked out great!

Thought this might be useful for some of you, or maybe even help with the LIF Secret Santa stuff!