Personally, I don't think there's any reason to cut anything out of the books for this particular movie, with the exception of scenes from the book that reflect the others books ( that were not in the movies ) a majority of this book will be stand alone and they definitely need to have the

Open scenes ( Dudley and Harry - with the Dursleys leaving )
the 7 Harrys and that fight scene flying in the sky
the wedding
the running away
the searching/finding of the lockets . . .

OOOHH!!! that's one thing they left out of #6 that was VERY important I just realized it . . . they didn't show Harry what Voldermort was like when he was older and that he liked to collect things . . . i.e.: the scene when he's with Hepsibah and she shows him the two items that he turns into horcruxes . . . that was VERY important, how'd I miss that and how'd they not put that into the movie - STUPID VERY important.

anyhow, enough of that rant and back to what they need.

finding the rest of the horcruxes
Hogwarts
Battle there and then the fight in the forest
Battle afterwards
The talk with Dumbledore

And yeah, they need to put "more" features in a 8 disc collectible with the scenes that should've been there . . . how come we never got peeves the poltergeist

Oh, and if I have mis-spelling of peoples or items names it's because I've never read the books, I know blasphemy . . . however, I have listened to them all on audio by Jim Dale ( AWESOME reader ) and I have gone through them all 8 times and I have just started number 1 again for the 9th time.

Thanks,
Cat