http://www.byond.com/developer/SadKatGaming/ 2DTileIsometricBlockTutorial

This library explains how to turn your old 2D Tiles into isometric blocks! Also includes a small section on the shading system that we at SadKat use to make more realistic looking isometric maps.

Comes with 2 Icon files, showing step by step exactly what happens at each stage in the tutorials, as well as a map file to show how the shading system can be used!