How to Install Siri Dictation on iPhone 4, 3GS, iPod touch 4G

Sources: (try all these if the other dont work)

http://cydia.xsellize.com/

http://apt.if0rce.com

http://cydia.myrepospace.com/0xjf

How to jailbreak iOS 5.0 & 5.0.1 - http://bit.ly/uyFc9F