http://sports.espn.go.com/nba/bottomline/scores (NBA) http://gdx.mlb.com/components/game/mlb/ (MLB) http://live.nhl.com/GameData/Scoreboard.json (NHL) http://www.soccerstand.com/static/default/livescore/master.1... (Soccer)

I've found some data sources online (different ones for each sport). It's probably not totally legal but I'll post the links when I get home.

Thanks for the feedback!