I've only listened to the album once, and have just started the second listen, but I can already tell this is one CD that is going to be played alot. From the raw, crazy sound of Scott's band Sex Bob-Omb, to classic's from T-Rex and The Rolling Stone's and to the genius that is Beck, this soundtrack is one of a kind. Also, just like the above reviewer, I have to agree that Crash and the Boys are brilliant.
My current favourites include:
Scott Pilgrim - Plumtree We Hate You, Please Die - Crash and the Boys It's Getting Boring By The Sea - Blood Red Shoes
Well, it's actually difficult to pick favourites when all the tracks are superb. Just buy it!