We have seen a video from Verizon named iDon't and an ansfer from iPhone fans - the video named iDon't Care. Here's a new one, called iCan. It describes what a jailbreaked iPhone can do:
Here is the list of apps for that:
Can be customized: using Winterboard
I can run applications simultaneously: thanks to Backgrounder and Kirikae
I can always use the tethering: thanks to the tweaks available in Cydia
I call with Skype on 3G network: using VoiceOver3G or 3GUnrestrictor
Support an open development: with applications to be released via Cydia