Electronically draw names for Secret Santa. Configurable - will even exclude people from being able to draw certain names, based on user-provided input (e.g., no drawing yourself or your spouse). Just need email addresses of attendees.
Grateful turkey (November Secret Santa)! At the beginning of November draw names from a hat and find a way to tell them everyday a new reason why you're thankful for that person through a note or service. Reveal who you have over Thanksgiving dinner.