With Dragon Dictation can use voice recognition to the current iPhone, and not only that, it works in Norwegian! And it's free!
With Dragon Dictation speak into a text that is presented on the screen. You can then choose to edit the text with the keyboard, or add text with new voice.
When you are satisfied with the results, you can choose to send it as SMS or email, post it on Facebook and Twitter, or cut out the text for use elsewhere.
We have some different experiences with this app, but essentially it works very well for short messages - typical SMS.
As said app is free, so it should definitely be tried out to get a taste of SIRI to come on iPhone 4s (SIRI will only be in English in the first place).