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Spire is a non-iPhone 4S working port of Siri. It's an easy port over, and doesn't churn up half as much space as you would think. On older devices, particularly iPod touch devices, it may run a little slow, and it all depends on a working proxy. But once you find one -- and be warned, you may want to pay for one, as they are readily available to purchase on the web as a premium service -- you will have a working version of Siri. Just hold down the home button and you are set to go.
International Business Times has a guide to install Spire on your iOS 5+ device.
But be careful. Your data may run through this proxy, so emails and other data may not be as secure as you would ordinarily like it.
Compatible with: iOS 5+ (including the iPod touch, iPad, and the iPhone 4 and 4S)