Here we go...sorry for the delay!
Allie - The Yule Ball was said to be a centerpiece of the film, but I didn't really view it that way. It was definitely featured, but no more so than the three tasks. There is quite a bit of romance, though, especially after the Yule Ball.
Solorund - Well, the soundtrack's on AOL now, so feel free to give it a listen for yourself. I loved it, though - blended in brilliantly with the film.
Razzberry - Came out fabulously!! David Tennant as Barty Crouch, Jr. is perfect. What a brilliant actor! And it actually does help that he was in that scene...I could see that happening in the book.
Krieltje - Shocking and sad, yeah, but only shocking for the first few minutes. Once they return from the graveyard, the fact that Cedric is dead starts to sink in and everyone gets quite emotional. Harry's crying is much improved over PoA.
Omerus_Banning - YES!
Dominique - Not all that close to the book, but it kept the spirit of it. A number of things were changed, but overall, I thought it worked well.
Sofie - Yeah, it is, unfortunately. Just too visibly flawed for me.
Pixymajik - Acting improved all around.

Bajab -
1) No, not really.
2) Yeah, mainly Dumbledore's character and the parting of the ways getting cut.
3) It'd be a bit difficult to pick up, but you'd catch on...eventually.
4) Only if you're really rich!
LalitaPotter - They did. But it's a kiss on the head and completely unromantic.