The Bush administration on Monday cleared the way for tens of thousands of acres in Colorado, Utah, and Wyoming to be used for oil-shale development, publishing final rules governing how federal land will be leased for extraction of the expensive, pollute-y, only recently un-banned fuel source. Companies tapping into oil shale will have to pay far less in royalties than the going rate for conventional gas and oil. Still, commercial oil-shale leasing is at least five to 10 years off.