Windows only: Free utility ImgBurn writes any disk image to a CD or DVD quickly and easily.
I’d previously recommended ISO Recorder for this task, but ISO Recorder only supports DVDs on Vista and it only burns .iso images. Aside from DVD support across the board, ImgBurn can handle other disk images types, and it’s the tool used in DVD Flick, which I’ve been very happy with. ImgBurn is free, Windows only. — Adam Pash