The NFL Playoffs are often an interesting test run for advertising during the Super Bowl. According to data released today from Ace Metrix, which specializes in television advertising effectiveness, Apple, General Motors (Cadillac), Applebee’s, Nissan, and Google were the most effective advertisers during the past three weekends of playoff football.

Apple held the top two spots with their iPhone 4G commercial touting new camera features (Ace Score: 659) and Siri ad (Ace Score: 658). Cadillac zoomed alongside Siri with its ad demonstrating its braking systems, achieving an Ace Score of 658. Nissan’s Vision ad was the 4th most effective playoff ad (Ace Score 652), followed by Google’s Muppet ad (Ace Score 644).

“We expect to see many of these same advertisers in the Super Bowl, and it will be interesting to see how they adapt their playoff strategies to television’s biggest stage,” says Peter Daboll, CEO of Ace Metrix.

Ace Metrix will reveal the Top Ads of the Super Bowl on Feb. 8.