A report released today by AdMob Metrics indicates that the iPhone and iPod touch accounted for 43% of worldwide smartphone Internet traffic in April and 59% of the smartphone traffic in the U.S. Nokia was in second-place worldwide at 35% and Research in Motion second-place in the U.S. at 17%. Worldwide HTML mobile browsing usage from the iPhone was 65% overall. This comes despite the iPhone presently having an 8% worldwide smartphone market share.…