It would appear as though Siri is not as unique to the iPhone 4S as was first thought with developers able to potentially port it to Android..
Mobile developers Applidium have cracked the protocols used for Siri which potentially means that if the right application was built, you could have Siri working on an iPad 2 or Android device.The developers worked out that Siri in fact does a lot of its work via Apple's own remote servers, which also explains why Siri won't work if you don't have a 3G or Wi-fi connection. They then discovered that if you could work out the correct code to talk to these servers then it could be sent from any device, not just the Apple iPhone 4S.
While the majority of how it works is so technical we're still recovering from the headache reading it, the summary is that unless Apple finds some way of protecting Siri's servers from communication that isn't from an iPhone 4S you could potentially see hacks that allow Siri to work on an iPad 2 or even a Samsung Galaxy S2.
Would you like to see Siri on your iPad 2, should it have been made available on the iPad 2 anyway? Let us know what you think via the comments box below...
iPhone 4S Siri Demo video