Fire Charge

A Fire Charge is an item that was released in the 12w04 Snapshot, which you can use like flint and steel. It is essentially a better flint and steel, as the fire spreads faster. It can be crafted with coal, gunpowder, and Blaze powder in any pattern:

When it is launched from a dispenser, it creates a fireball which acts like blaze's, catching the entity or block it touches into fire. This is pretty interesting in multiplayer PvP, since you can use this item as a cannon salvo.