Here is part 1 of a great new tutorial from Juwal Bose on TutsPlus: "We have all played our fair share of amazing isometric games, be it the original Diablo, or Age of Empires or Commandos. The first time you came across an isometric game, you may have wondered if it was a 2D game or a 3D game or something completely different. The world of isometric games has its mystical attraction for game developers as well. Let us try to unravel the mystery of isometric projection and try to create a simple isometric world in this tutorial.
This tutorial is an updated version of my existing tutorial on creating isometric worlds. The original tutorial used Flash with ActionScript and is still relevant for Flash or OpenFL developers. In this new tutorial I have decided to use Phaser with JS code, thereby creating interactive HTML5 output instead of SWF output."