If I actually owned Minecraft like Notch these are the things I'd add.

*Television - You can watch YouTube videos on it This would be sweet if you can't be bothered to exit Minecraft to go on YouTube.

*More Food - I would add more food because ... well ... the food in Minecraft at the moment is a bit boring. I know the puffer fish looks quite cool, but well, more food would look awesome.

*Sinks and Taps - You would have a dirt-o-meter on top of your hot bar. You would you the tap to get rid of most of the dirt on your hands. Also black and brown particles are added to your hands.

*Cars - You would be able to drive a car, but you'd need a drivers license, you get one by going to a driving test area which are randomly spawned.

*Bins - You could bin your stuff and never see it again bin men come whenever you put your bin outside. This would be awesome.

*Hoover - Whenever you walk over something you make very small dirt marks. You can get rid of these by using a hoover. This would make Minecraft very realistic

*Mobile Phone - Mostly for Multi-player, you get a phone number and a phone. You can call people for a wooden plank. You use your mic for the voice. Also you can text message to one person for free.

*Lights - Again, this would make Minecraft more today. You can switch them on and off by clicking them. This would increase light by 8.

That's all!

Peace out