Google's latest version of its voice-enabled Search app may not have the personality of Siri, but it is as good, if not better, than Siri at pulling up relevant search information. If you want to replace Apple's personal assistant with Google's version, you can do so thanks to a jailbreak tweak called NowNow.
As spotted by AppAdvice, NowNow is available in Cydia and allows you to launch Google Voice Search anywhere in iOS. It requires you to install Activator and Google Voice Search, but once you set it up, it's as