Criterion's awesome, free update to Burnout Paradise includes the addition of bikes. You can download it now for 360 and PS3. See how they handle in this little movie below.
The dev says, "With the new Bikes pack, players pick from two fast and sleek motorcycles featuring a male or female driver and start on a whole new progression to earn a bike license. There are 38 new against-the-clock race events; some tailored for the day (Burning Ride), others designed for night runs (Midnight Ride)."