YouTube has had a revamped look for channels in limited beta testing since early February, but it's now ready to spread the new-layout love to interested folks. Dubbed "One Channel," the design refresh places an emphasis on making a user's page look slick across different screen sizes and devices, adapting its style for the occasion -- yes, even on TVs. Along with a look that provides more visual breathing room, a wide image called Channel Art adorns the top of a page, giving the whole affair a stronger
