I posted about OpenSiri yesterday which I said was probably one of the best Cydia tweaks, well this one is better.
SiriToggles takes OpenSiri and VoiceUtils and combines them into one. With this Cydia tweak you can control many aspects of your iPhone just by ordering Siri to do it. You can turn on and off settings such as Wi-Fi, 3G, Bluetooth and others. It also does surprisingly well launching a various number of apps. I was able to launch nearly any app which has correct wording such as Angry Birds, Cut The Rope, Mega Jump and others. Apps named with words which aren't in the English dictionary tend not do so well, such as Tumblr, Pinterest and Flipboard.
It's located in the BigBoss repo and is simply named SiriToggles.
Please check out AssitantExtensions which is better than SiriToggles!