I must admit that I love the hell out of that game, but I am disappointed that the US release makes no mention that it is a sequel to Ico, which is also an excellent game. Shadow is so much more interesting once you know that the characters are Ico and Yorda.
I will not spoil but the end in SOTC has an link to Ico ;D
It is normal that SOTC contains a link to ICO - the creators of ICO made it - logical, isn't it .
I must admit that looking on screens and watching videos it's a very spectacular game that everyone with PS2 should have. I am curious how do they get PS2 Engine to render that complicated, big objects that are still high-quality without an big frame drops. The game is high rated already, so get it while you can. Interesting story, nice graphics, not perfect but good sound - voila.