Google has been pushing "voice search" pretty aggressively over the past couple years. One of the very few surprises yesterday from the Nexus One press conference yesterday -- given that everything had already leaked -- was that Google has voice-enabled every text field on the device, not just search and maps, but email, SMS, presumably apps and so on.

This was impressive to me and perhaps the most compelling aspect of the phone other than its speed. Dan Miller does a deeper dive regarding voice here. 

And you can watch a video of the entire press conference here. Here's what the WSJ's Walt Mossberg said about the voice "dictation" capability from his several weeks with the phone:

The Nexus One is packed with its own tricks. Its version of Android is essentially the same improved edition as the one that appeared on the Motorola Droid back in November. But it has a few new features, including an experimental dictation capability. You just press a microphone icon on the keyboard and start talking, and the words appear. In my tests, this worked only adequately at best, and very poorly at worst, but Google insists it will learn and improve.