One week ahead of its release in stores, "Circus," the new album from Britney Spears, has been posted on the Web at imeem.com where fans can listen to it for free. The album features 13 tracks by the pop star, including the now familiar "Womanizer," which was previously released, as well as other songs such as "My Baby," "Unusual You" and "Kill the Lights." Releasing songs on the Web increasingly is being used to promote musicians and their work ahead of an album release, and Spears' "Circus" is among the most anticipated CDs of this year as she rebounds from a tumultuous 2007 and early [more]