Talking to machines and being heard : Getting started with speech recognition — from uxmag.com by Dave Rich

Excerpt:

Speech recognition presents an exciting and dynamic set of challenges and opportunities for UX designers. With the mass-market reception of consumer technologies such as Apple’s Siri and the near-omnipresence of speech in telephone applications, speech recognition is a computer–human interface many people interact with daily. Speech applications range from self-service telephone systems such as banking applications, to mobile applications that allow users to speak commands and compose messages with their voice. In the future, we can expect to see many different applications integrate speech recognition in some form. The time is near when speech will be the most universal user interface.

Addendum on 7/12/12: