AssistantExtensions is great new tweak that allows fluent conversation with Siri and native youtube search. This tweak also opens a library for developers to create easy plugins for Siri without a Siri Proxy. This tweak is free in cydia in the big boss repo and opens up a great new window of opportunity for developers. Siri add ons can be made in Xcode or through make files.
The built in bot for Siri that allows fluent conversation with Siri is a great addition to this tweak to truly show the power of these add one tweaks. Check out the video below for a demonstration of the conversation and Siri youtube search plugin.
Developers can read more here: http://ae.k3a.me/