A new jailbreak tweak called the voiceactivator is going to be made available sometime this week that will enhance the present functions of the voice control feature in the iPhones. The current functions of voice control allow a user to make calls, play the song from a particular album or by a particular artist and also enable the genius feature. This is in fact a very useful function while driving.
The new voiceactivator tweak which is being developed by developer chpwn would also allow one to open Apps, URLs and also enable Activator functions. The following is the tweet by chpwn-
Custom Voice Control commands! VoiceActivator is a new tweak by chpwn (http://chpwn.com/) to let you take full control of the Voice Control feature of your iPhone or iPod touch. Launch apps, open URLs, use Activator actions: it’s all here, in on
chpwn is also the developer of the jailbreak apps Infinidock, Infiniboard, Infinifolder and Proswitcher.