I haven't really thought about it much, but if I had to pick three things off the top of my head...
Ocelots- Take one with me along with a wolf so that Creepers won't attack me and so I have a partner to help me during unwanted fights.
Village Trading (which would also enable Emerald Ore.)- The villagers feel useless and most of mine wander about in the desert now, since I kinda stole all their doors when I first started....anyway, would be nice to be able to get good items from them.
Anvil- I want to be able to rename and repair items.
If I wanted to play the pc version, I'd play that. I want unique items and such for the 360 version.
They give the 360 unique features and with in the week it will be modded to the PC version so I guess you'll still end up playing the PC version. --- Everyone needs a pony I call mine Mander1861 Were partners for life brony power