Credit:
The game, in which you buy a gift for a randomly-selected colleague you might not be close friends with, intentionally shakes up the cliques that typically form at your workplace. Any yet, the outcome is usually a crappy gift. Elfster claims to fix that with features like wishlists for each user, "do not need" lists, and the ability to ask anonymous questions to the person you're buying for.
That said...aren't crappy gifts part of the fun?
See also: CHRISTMAS TOOLBOX: 20+ Tools For A Merry Christmas