you dont have to have a freesat card with a sky digibox, but if you choose then it costs £20. I have the oposite view to TheWakeUpCall's post above, i would swap E4 & More4 for the tons of extra on satellite anyday. Each persons view is different, but it still dont mean you can use a 'Freeview' terrestrial box with a sky dish .
I didn't think that you had to pay for freesat cards. Has that changed recently ?
When I got mine it was free, although I think the BBC were dishing them out then. I've got both freesat via a Sky digibox and Freeview (built into TV). Their channel line ups are similar. You need to look at the lists to see which suits you best. I keep the freesat as its connected to my Tivo for recording programs.
you will receive itv without a card.
To confirm guys, a freesat card costs £20 (has done for couple of years at least) and currently gets you these channels extra- Channel4, Five, Five Life, Five US, and Sky3.