Live Sports Scores
CBS Sportsline - By far the fastest updating site for all major sports scores. NBA Sports Scores, NFL Scores, NHL Scores, Major League Baseball Scores, College Football and College Basketball and many more. I have tested all the major sites (Espn, Yahoo, etc) and none of them update as fast as CBS Sportsline. I have the NBA League Pass, and when watching a game, the scores are updated normally 1 or 2 seconds after a score.

They also have a "My Scores" feature where you can add specific games in various sports to a customized page. This comes in very handy for watching games that you have action on so you do not have to flip between pages. I also use it to help me with start times for late games if I am waiting closer to game time to place my wager.

Tracking Line Movement
RX Line Feed - Best free line movement feed I have found

Best Sports Betting Forums - The best active handicapping forums I have found
Cappers Mall Forum

The RX Forums

Covers Forum

SBR Forum

Free Picks
My Free Sports Handicapping Picks page - updated multiple times daily

Trends, Matchups, Stats, etc.
Sports Matchups and Stats at CasinoDave.com

Cappersmall Matchups page

If you're looking for the best arbitrage betting system and overall top notch sports betting strategy then you must definitely download the free dominate sports betting ebook.