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User interface

http://www.nngroup.com/articles/short-term-memory-and-web-usability/ Summary: The human brain is not optimized for the abstract thinking and data memorization that websites often demand.

Short-Term Memory and Web Usability (Jakob Nielsen's Alertbox)

http://en.wikipedia.org/wiki/VoiceXML

VoiceXML

VoiceXML ( VXML ) is the W3C 's standard XML format for specifying interactive voice dialogues between a human and a computer. It allows voice applications to be developed and deployed in an analogous way to HTML for visual applications.
I think you're sort of seeing the inevitable complexity to it all Ben.

Accessify Forum: Adding a voice interface to a site.

http://www.accessifyforum.com/viewtopic.php?t=9719
The Voice Browser Working Group's mission is to support browsing the web by voice . http://www.w3.org/Voice/

C "Voice Browser" Working Group