Because four of the six major studios decided to ditch HD-DVD, so has Netflix.
Tho it will still carry HD-DVD until stock is phased out at the end of the year.

Blockbuster apparently is supposedly still carrying the HD stuff, but I havent been near a blockbuster in years to check that out.

Well HD-DVD, you are cool in your very own way, but I am glad I didnt spend money on you.