George Strait's double album, 50 Number Ones, has been certified seven-times platinum for shipments of 3.5 million copies. (Both discs are included in the certification total.) Strait released the set in 2004 and released a companion disc, 22 More Hits, in November. Strait's four-disc set from 1995, Strait Out of the Box, is still his best seller, at eight-times platinum. He begins his 2008 tour on Jan. 10 in Austin, Texas.