YouTube has upgraded its mobile website to make it more convenient and appealing to watch videos on touch-screen devices such as Apple's iPhone and Motorola's Droid X.
The improvements unveiled Wednesday are designed to make it easier for smart phone users to navigate YouTube's vast video library. The fine-tuning also enables YouTube's mobile website to stream videos in higher resolution than clips served up through YouTube applications installed on smart phones.
YouTube, owned by Google Inc., is changing its mobile website as part of its effort to create a "video operating system" that works on any gadget with a screen.
The video site says it already serves up more than 100 million videos per day on mobile devices.