Miley Cyrus became a spokesperson for Daisy Rock Guitars in 2004, when Miley Cyrus was presented with her first Daisy Rock guitar — the Stardust Series Acoustic Electric Pink Sparkle.Disney released a Hannah Montana clothing collection in late summer 2007. Miley Cyrus helped to design some of the pieces from the collection.
In December 2007, Miley Cyrus was ranked number seventeen in the list of Forbes Top Twenty Superstar Earners under twenty five with an annual earning of US$3.5 million.
A wax figure of Miley Cyrus was unveiled at Madame Tussauds in New York City.
In April 2008, Miley Cyrus signed a contract to pen an autobiography reflecting on Miley Cyrus's life up to the age of 16. The memoir, called Miles To Go (ISBN 978-1-42-311992-0) was (Ghostwriter) written with Hilary Liftin and was published by Disney-Hyperion Books in March 2009. The memoir discusses Miley Cyrus' relationship with her father, her thoughts on the media, her love life, her future ambitions and milestones she still has to reach in her life. Miles to Go reached number one on the New York Times children’s best seller list. An initial printing run of 1 million copies of Miles to Go is planned.