Nuance updated “Dragon Go” today; it’s a free piece of voice recognition software that does a bit more than anything prior (including Siri).
For example, you could say find music by Stephenwolf - and it will give you choices from your library, iTunes, Pandora as well as YouTube and Google searches.
Pretty slick. I think Android will have something similar in 6-8 months.
The Pannous voice actions app for DROID already does most of what Siri does.