New (ish) app recommendation.

[Pistachio]

I have just come across an android app called Sherpa (still in beta). Is is a voice recognition personal assistant app - how I imagined siri to be (not that I have ever used it).

Well worth checking out if you have not already found it.

 

[eugenerudenko]

There're several such apps.
You can find the discussion about them here:
S-Voice alternatives - Android Forums
S-voice sucks, best alternatives? - xda-developers
S-Voice alternative?

And within the discussions there're further references.