A personal favourite of mine 
Propel your inventories upwards using this block! Stack it up on top of a chest for example, and upon right clicking the block it's as if you right clicked on the chest itself! Remove or add items at will  And you can even use hoppers! It's like a chest... with 64 SIDES

Screen Shot 2013-11-13 at 00.36.30

Recipe: Edit

Screen Shot 2013-11-13 at 00.37.27