A small idea, was a Block, or orb (In Minecraft?!), of UU-Matter created from 8 UU-Matter in the crafting grid, ignoring the middle slot. This allows for major storage of UU-Matter.
Also, Coal Block and Redstone Block (looks like Glowstone, requires 4 redstone is a square, but is red and glows at light level 7?) to make up for Notch's laziness.
Was also thinking of 'Dust Piles'- Like Blocks, but for dust, so you can store large amounts without having to re-macerate bars.
...I like storing massive amounts of useful stuff for major projects.