How come movies look so much better in blu-ray than HD?

Just the difference in the 2 techs. Toshiba is coming out with a new super HD that will rival Blu-Ray. Down the road there will even be more up-grades. Panasonic just came out with a 150" Plasma TV with a pixel size 4 times anything else on the market ... at a cost of about $100,000.00 so I won't be getting one real soon.

This can also depend on the kind of tv you have. The setting you have on the tv and everything.