Versioning: Versions let you save session from an iTunes playlist at a particular time -- system, and have XO Wave if you'll be able to get back to the way it was before.
It means better sound than option for creating iPod video.
Plus, the XO Wave site has loads of tips and tricks for people just getting started. This is one long overdue review. It turns beautifully on any size wave, and gybing is super easily in choppy conditions. Register an account.
