MINECRAFT SKINS
(So you don't have to look like "Steve?" anymore)

Minecraft Nostalgia         For when you want to play an older version of Minecraft - or when you goof up and update before the server's do
Worldedit CUI                   Allows you to visually see your WorldEdit selections for when you are protecting your house
Rei's Minimap                   Adds a small map of your surrounding area to the upper right-hand corner of the screen
Inventory Tweaks             Organizes your inventory for you