SC2Mapster

Blizzard has released some new SC2 Fanart, pretty sweet stuff, go check it out!

GalaxyEditor Enhancement by Renee

This is a pretty awesome "plug-in" for the Editor made by Renee. It's just an SC2Mod that you add to your maps, but it adds a slew of new Trigger functions and XML data you can take advantage of.

D3 Models to SC2 by Corbo

This tutorial does exactly what it says, it's a quick and easy way to convert Diablo III Models to SC2 Models! This means we can make even better Diablo-esque maps, :).

Map Template Doodad by Saeris

This tutorial goes over the process of taking a scanned sketch, cleaning it up, creating vector outlines from it in Illustrator, saving it as a texture and applying it to a model, and finally Importing it into the Galaxy editor where it covers how to make it a doodad and it's basic use for blocking out terrain.

The great thing about using a template like this is how much faster it makes creating terrain. Before this, you'd have to really eyeball your terrain layout and hope that you've got equal sizes around your maps, or, spend hours looking at the grid and trying to match things up that way if you wanted any sort of symmetrical map. More complex designs, such as circular layouts, are easier than ever before with this technique. Plus, if your map ends up being too big or too small, all you need to do is resize the map bounds and the doodad, and you don't have to start all that tiresome work over again.