Virgin Mobile's Festival will be free just like it was last year. And it'll happen September 25th at Maryland's Merriweather Post Pavilion. Sir Richard Branson took a break from para-sailing or base-jumping or whatever from the Virgin Islands (seriously) to announce the bands. The lineup (with "more surprises" later, according to Sir Branson): M.I.A. Pavement Ludacris LCD Soundsystem T.I. Joan ...