AdMob, recently acquired by Google, has released their latest set of mobile metrics [PDF link] and the iPhone and iPod touch platform (iPhone OS) has a comfortable 50% share of worldwide traffic, and 55% of US traffic. That’s up 6.9%. In terms of top handset models, Apple’s iPhone accounted for 22.4%/24.1% (up 5.5%/5.2%) and iPod touch for 9.8%/11.4 (up 1.4%/2.3%)

Also up is HTC on the back of the Android Dream (G1) and Magic (MyTouch) to 5.6%/9.5% (+1.2%/1.8%) and BlackBerry maker RIM to 3.2%/5.4% (+0.1%/0%).

Everyone else was flat or down, with Nokia posting the biggest drop internationally (-2.6%) and Palm in the US (-2.2%).

Droid and other future Android devices will likely change things up for next time, perhaps webOS when it hits other carriers as well.

For now, however, Apple’s iPhone juggernaut continues.

According to Admob (via TUAW), Apple’s share of the mobile Web is big and might just be getting bigger:

Worldwide requests from Apple devices grew 28% month over month to 1.2 billion in January. Building on its strong December, iPod Touch growth outpaced iPhone growth in top markets. The iPod Touch now represents 40% of Apple requests, up from 20% in September.

People like great mobile browsers that can handle HTML, CSS, and AJAX, who’d have thunk it?

Of course, competing devices from Nokia, Palm, and Google, are beginning to use Apple’s WebKit in browsers of their own, Firefox keeps threatening to push their mobile Fennec client to release status, and RIM is inching the Bold towards usability, so can Apple and the iPhone/Safari team maintain their leading edge?