Sportpunter keep an accurate account of all their bets for all sports, and shown below is the results for NFL. Predictions are from the year 2010/11 onwards:
Featured Models
Sportpunter AFL Model
With over ten years of live betting history on the net, and large profits almost every year, the Sportpunter AFL model is the best anywhere to be seen. More than 10% ROI had been made and is on sale now at the Sportpunter AFL website
Sportpunter Tennis Model
Sportpunter's tennis model has been one of the longest running. Operating since 2003 it has made around 5% ROI over the years. And with many matches being played, it is a model that tennis betting enthusiasts need behind them. More info here