Apple saw a 172 percent increase in traffic to its Web site Sunday thanks to Pepsi’s iTunes commercials that aired during the Super Bowl, analysis from comScore Networks shows. Napster, which advertised for the first time as a rival to iTunes, posted a greater than 30 percent increase on Super Bowl Sunday. “Although iTunes turned in stronger growth than Napster for the full day, both sites increased visitor levels by almost 300 percent above the 30-minute average following their respective commercials. This year, traffic at iTunes peaked just after the advertisement featuring the Pepsi-iTunes promotion, unlike last year when more visitors waited until halftime to explore the iTunes site.”