http://ebird.org/ebird/site/yard# (click year tab)
Starting to get fun!
(PS- Just now as dusk went down I had a flyby SORA giving the upslurred 'tuwee' note, and late this afternoon I added BANS to the swallow list, mixed in with the same swarm over Whitefish lake which hosted CLSW).
2013 and beyond
It's pretty simple: the most birds seen or heard from one's yard during 2013 will be the "winner". Want in? O.k....then do it despite that.
2013 promises to be a lot less mean but still a carbon-free birding competition, even if slightly less exciting than a MEGA x EPIC hybrid.