"TV on your PC"

Just seen an advert for a product to watch "hundreds of channels" on your PC without the need for anything to be connected to the PC...

Are these things genuine and are they legal?

This was the advert, by the way.

Sounds like you'd be paying for a graphical wrapper to access on-line tv that can already be accessed for free through many tv portals such as http://wwwitv.com

it's amazing what you can find with Google