Wired’s Wiki has an interesting tutorial on converting your soon to be outdated HD – DVD’s to the soon to be Prom King, Blu Ray. It seems easy enough but from my estimation, it might actually be cheaper, and easier to simply re – buy the proper format as opposed to going this conversion route. It calls for both the HD DVD drive on your pc as well as the Blu Ray Burner, not to mention the cost of software. Don’t it feel good to jump on the right band wagon first? 
Read more here.