Sparging is exactly what you just said, using water to rinse the grains and get all the sugars out. I'm not exactly sure what to call DeathBrewer's method, I guess it is a form of batch sparging. Most sparging methods, though, involve draining the water used for mashing, and then pouring the sparge water over the top of the grain, and then draining again. Fly sparging is where you use some type of sprinkler to continuously add water as you drain, and keeping the water level in the tun more or less the same throughout the sparge. Batch sparging is pretty much (gently) dumping all your sparge water into the tun at once and then draining it quickly. With my all-grain batch last weekend I just did the DeathBrewer sparge, so I haven't done a proper batch sparge or a fly sparge. From reading though, it sounds like there are advantages and disadvantages to each method, but if you're just starting out with all-grain batch sparging is probably the way to go since it takes less equipment and requires less attention and effort on the part of the brewer. You'll probably get lower efficiency though.