I have registered for the following Fantasy Golf Sites:
Not my favorite league format because of the focus on daily scores instead of the final overall (there is a bonus, but it's still about daily low scores), but it does have a nice private league section with message boards and segment scoring.
PGA Tour (sponsored by Avis) Fantasy
The PGA Tour league has already started so I'm late to this game but it looks new and improved from the past versions. You are still able to have up to 3 teams and it looks like there are 4 active players with 2 bench players you can bring in. You can only use a golfer 3 times per segment so that will make it a little more thoughtful...AND the scoring is quite complicated! All kinds of stats are used to earn points, so it may require a little more research each week. The first few weeks in January will be practice since this segment started last fall. Segment 2 started the first week in February (WMO).
If I find any more sites pop up I'll let you know - or if you know of some please let me know!
Buzz Fantasy Leagues
I'm a fan of Buzz!! They have free leagues as well as pay leagues and the option to have private leagues (for a fee I think). They also have the Make the Cut Challenge - where you simply pick a player each week and if he makes the cut you're still alive! It sounds simple, but it will drive you bonkers at times! I think the statute of limitations is up on my being mad at Jimmy Walker for missing 1 cut a few years ago...the week I picked him! And this year they are partnering with Rockbottom Golf to have a nice prize pool.
Golf Channel Fantasy
Golf Channel is pretty straight forward - 1 guy from 4 different groups - and then you're on your own! I remember having some pretty awful weeks in the last few years!