WD's My Book AV DVR expander addresses these issues by providing users with up to 120 additional hours of HD storage for their TiVo, DirecTV, Dish Network and other compatible DVRs.
If you'll recall, G.hn was just recently ratified by the ITU as a new global standard for HDTV home networking, and while it's tough to tell how it'll react to HomePlug AV vying for those same customers, we can already see a battle shaping up.