Virtually leading the blind
Virtual environments are an extraordinarily useful piece of technology, being that they possess most of the qualities of the atomic world (obviously barring physical substance and fine granularity) at an infinitesimal fraction of the cost of the real thing. As a primarily visual medium, however, what do you do if you're blind or significantly visually impaired yet still want to use Second Life?
Well, one option is TextSL, but then there's Max. Max is a virtual guide-dog to allow the visually impaired to interact more readily in what is primarily a visual environment.
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http://www.massively.com/2009/04/03/virtually-leading-the-blind/