How to use IBL on Blender for lighting?

The use of IBL for architectural visualization is mostly related with external views, and furniture design, where we can add the model into a scene that looks like a studio setup to generate reflections. I still remember the days where we had to use external render engines to use HDRI in Blender, and most artists couldn`t rely on this type of lighting. With Blender 2.5 things get a lot easier, and we can use IBL with Blender internal render.

If you never used IBL on a project, here is a great opportunity to learn about IBL. An artist called LaH, posted a tutorial about how to setup IBL using three different images for lighting.

This could help a lot on external visualization projects for architecture.