I use Siri to check my appointments and for cooking all the time (I use it for the timer).
However, my use of Siri has been limited because outside the US, it does not know what business are around you. Thankfully, iOS 6 will change all that. Siri now has a directory of businesses outside the US and you can ask it for the nearest school, hospital or restaurant.
Developers like Lim Thye Chean who have played with Siri say it definitely works for Singapore.
In addition, Siri now handles Mandarin so you ask questions in Mandarin. You can also do dictation in Mandarin too and Siri will transcribe your speech. Thye Chean says the Chinese accuracy for him is in the range of 90 percent. Pretty cool.
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