Yahoo Golf
thedivot.com's top pick.
Easy to use if you have a Yahoo ID - week by week competition - in private groups, or see how you stack up against everyone - pick 8 players, 4 active and 4 on reserve... start and bench 'em during the event.

Bully Sports
Four segments - 25 man roster with a $16,000,000 cap... each league set up has only 20 teams, so you have a 1 in 4 chance of at least winning your initial entry fee back.

Bully Sports
Three 13 week phases - grand prize is a set of Callaway X-12 irons.

CBS SportsLine Fantasy Golf
A fantasy section filled with stats, updates, and news features - free trial membership.

CBS Sportsline / Bank of America Fantasy Golf Challenge
Grand Prize trip to the 2003 AT&T Pebble Beach National Pro-Am. You will also have a chance to play in the Pro-Am portion of the event

CNN
Free - all season long sign-ups - and very well done.

ESPN
One of the best run and maintained.

Fantasy Sports Golf
From Prime Sports Interactive - 2 versions, both pay for play.

Golf Craze Game
GolfCraze site - treats the Tour like the stock market.

Golf Investors
Also a stock market game, but this one has news and actually tracks golfers on charts, has most actives, and big gainers & losers.

GSM: Golf Stock Market
Fantasy golf arena is active 24 hours a day, seven days a week. Find all the rules and regulations on these pages where golf and stocks collide.

MSNBC Fantasy Golf
Plenty of information to build your team. Easy to sign up and use.

The Golf Channel / TourTrade
12 golfers with a $10,000,000 cap.... $10,000 cash prize.

TourGolf.com
Free - you rank your picks according to how individual players are going to do head to head.

USA Networks
pretty weak prizes so far...