According to the latest data from mobile advertising firm AdMob, the iPod touch is playing a large part in the growth of traffic from mobile Internet devices (MID). The company’s newly-published February Mobile Metrics Report (PDF Link) states that traffic growth from MIDs is outpacing that of smartphones and feature phones, increasing 403% over the last year to account for 17% of AdMob’s traffic in February. The iPod touch is by far the leader in the category, accounting for 93% of this traffic. Likewise, strong growth in iPhone and Android traffic, fueled by heavy application usage, helped boost overall smartphone traffic by 193% year-over-year. Smartphones now account for 48% of AdMob’s worldwide traffic, with the iPhone accounting for 49.5% of that traffic, a figure that’s down 0.9% from January. AdMob’s numbers are based on ad requests for more than 15,000 mobile Web sites and applications worldwide.