Amazon has expanded its Video on Demand service with new HD content, including movies and TV shows. TV shows are available on compatible HDTVs, set-top boxes or on a computer as a stream or download. The HD movies are not yet available for computers, however. The company already has 500 TV shows and movies available, with more to be added in the future.

Top-selling TV series include "Fringe," "Californication," "Terminator: The Sarah Connor Chronicles," "House" and "Heroes." Popular movie titles include "Frost/Nixon," "Twilight" and "Yes Man."

Amazon's HD content is available on TiVo Series3, HD, and HD XL DVRs, the Roku player, Sony Bravia Internet Video Link devices and Panasonic Viera Cast-enabled TVs. HD movies can be rented for $4 to $5, while TV shows can be viewed or downloaded for $3.