We can't believe it's actually here, but after hearing whispers of a Google OS for what seems like ages now, the company's now gone official with its plans. According to the official developer blog, it'll be an open source, lightweight platform that can "power computers ranging from small netbooks to full-size desktop systems," and will be capable of running on x86 (that includes Intel Atom) and ARM chips. Addressing potential overlap with Android-based netbooks, the official line is that "choice will drive innovation for the benefit of everyone, including Google" -- a pretty wild statement to make, but hey, it's still all Google. A large portion of its fresh out of beta Google Apps suite already supports an offline mode, so we guess the groundwork's laid out. The company says it's currently working with a number of OEM manufacturers and that it'll initially appear on a number of netbooks coming to market sometime in the second half of 2010. Excited? We are.