back on topic, i had normal Sky on my HD Plasma (albeit through a decent gold-plated scart) and noticed it was a bit naff on some channels (especially some of the cheapo music channels who broadcast in very shite quality!). i have a DVD upscaler, so after watching films on that and switching back to the TV it was a bit of a disappointment.
i recently got sky HD and there is a slight improvement on all the channels, but the HD channels are absolutely stunning. i find myself watching programs all the way through ( that i wouldnt normally watch) because the scenery and special effects is so droolworthy.
and the footy looks amazing.
Sky HD is a bit pricey, but well worth shelling out to make the most of your HD telly.
and you get the sky plus free with it.
there is 12 HD channels on ours, they seem to be adding extra ones quite regular now.
you can buy the sky HD boxes a bit cheaper off ebay but i couldnt be arsed.