Ah, Minecraft; A land full of adventure, battles, and magic (literally, with mods!) - You can build anything you'd like, wherever you want...
...Until it comes to making a pond, lake, dam, river, or ocean.
It takes ages, constantly making bridges across and filling it slowly, one bucket at a time.
NO MORE! With Infinitely Spreading Water, server owners and creative mode users can fill bodies of mass size (and potentially destruction) with ease.
There is no crafting recipe for the infinite version, but future versions of the mod will include craftable blocks that will not be infinite. If you don't want them, just stick with version 1.0 :)
Including a handy 5 second delay before water spread starts, you still retain some control in case something goes horribly wrong. (For everything else, there's the /replace command if you have it)