Google's speech services on Nokia N9, as simple as select a new keyboard and now speech-to-text sms, voice dialing and voice search is available to N9: QVIK (Quick Voice Input Keyboard) supports every Google speech-services language, even if it has been tested only for English, Spanish, Italian, French and Deutsch. Now speech-to-text SMS, voice dialing and voice search is available to N9.
For voice commands just open Search app and dictate a program or a contact name.
To improve results switch to "More accurate" in configuration app "Voice Input".
The SOS button, placed on the bottom-left corner of the screen, permits to switch to a standard english keyboard in case of emergency.