Script Summary: For Yahoo Fantasy Football, adds a fantasy pts column to the player's game log based on your league settings with a week to week breakdown.
ATTENTION! Prior to using this script (after installing it) you must visit the league settings page for each league you own so the league settings will be saved.
The fantasy points displayed on the game log will use the settings of the league you are currently viewing. A message will be displayed above and to the right of the game log showing which league's settings are being used. The points generated are about 98% accurate. It cannot take into account things like tackles for offensive players and other small additions and subtractions that are not displayed on the players game log.
Also, if you mouse over the league's name a popup will show you the current settings being used.
For easy access to the game log I would also suggest using a userscript which adds the game log link to a player when he is displayed anywhere on the Yahoo NFL pages, there are several out there that do this.
Sept 2010 Update - Yahoo changed the format of the gamelog slightly, adding a playoff stats table if the player had ever played in the playoffs. I added logic to account for this. If anyone is having issues please let me know.
edit#2 - I also tweaked the popup to a span that way the mouseover for the league stats doesn't trigger for the whole cell.