This script is easy to use and is actually quite good at what it does. It does not predict games but how strong the teams are compared to the other teams in the league. As the season goes on it gets better and better at calculating team strengths and weaknesses. You will find that the teams ranked high in the power rankings are also the ones who go on to the playoffs usually.
Load this baby up though Firefox and Greasemonkey and go to your league page and you will find it waiting to calculate your leagues team power rankings. Open the options and you can adjust it to favor certain criteria as well.
After running the script it's quite simple to highlight the info, click copy and then paste it to either your team forum or better yet your league forum. Always a crowd pleaser and gets the forums talking.
I recommend this one highly.