I yesterday got the much awaited for update to the phone software to Android 4.1.

Its just minor refinements, but now also includes "Google Now".

I havent turned that on, as its creepy for your phone to know that you are going work befoer you do... but you can still use voice with the google search box and its really good.

Without turning on Google Now, I dont know a way to get the weather to be set to celcius instead of centrigrade, but its still good. It can answer some queries in voice, for others it will bring up google search results if needed or even carry out actions.

"Is it going to rain tomorrow?" (spoken reply) "yes, the forcast for tomorrow in ... is 45 degrees with rain"

"Set alarm for 9am"

"Send message to ..."