"On September 8, 2006, Microsoft announced the Platinum Collection would be extended to the Xbox 360 platform. On September 20, 2006, at Microsoft's Pre-Tokyo Game Show conference, they announced Platinum Hits for the Xbox 360 in North America, priced at US$29.99 and Classics in the UK for GB£24.99. A second wave of titles was released in early 2007, with additional games being added periodically."
Source: Wikipedia, "Platinum_Hits", available under the CC-BY-SA License.