I personally don't give a damn about this gimmicky piece of software, but if you have a jailbroken iPhone 4 now you can add full Siri functionality using a Cydia program called H1Siri. Unfortunately, there's a catch.
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Grant Paul has detected that the hack sends your personal information through a server in China. And with personal information I mean email, SMS, calendar, contacts and location. Good luck with that.
And to top it all, it uses copyrighted Apple code. Don't install this stuff. You are not missing much. [Twitter via iDownloadblog via TechCrunch]