With mobile devices accounting for more and more internet usage, more and more focus should be placed on advertising on these devices. A key challenge is creating a landing page that is useful on each of the different devices and their corresponding operating systems. While there is currently no standard for optimizing pages for all devices, you can tailor different landing pages to each device.
Through Google Adwords, you can now target your campaigns to different mobile carriers and devices. This way, you can have a different landing page optimized for each device, and target your ads to only display on that device.
This new targeting is also useful if you are advertising carrier or device specific products. For example, if you are selling screen protectors for the myTouch 3G, you can set your campaign to only display ads on that device, so you are only reaching your target audience.