Anything from David Levithan. And this one sounds like Quantum Leap (as Stephanie points out), the cool TV series from the early 1990s (see the IMDB profile here; we’ve also got it on box set DVD ($8 for three weeks) here).
Every Day, by David Levithan (September). A novel about love and messing with the time-space continuum (or something like that). “Every morning, A wakes in a different person’s body, a different person’s life. There’s never any warning about where it will be or who it will be. A has made peace with that, even established guidelines by which to live: Never get too attached. Avoid being noticed. Do not interfere. It’s all fine until the morning that A wakes up in the body of Justin and meets Justin’s girlfriend, Rhiannon. From that moment, the rules by which A has been living no longer apply. Because finally A has found someone he wants to be with – day in, day out, day after day.” (goodreads.com)
At Entertainment Weekly’s website there is an exclusive video of several authors taking turns narrating A’s story. You can see if you recognise anybody here.