zToggle can now disable multitasking and background Springboard iPhone 3G and iphone 4 [Cydia]

Ztoggle, the tool that lets you enable and disable multitasking and background Springboard iPhone 3G, is updated for compatibility with the iPhone 3G and iPhone 4.

 With this update now you can disable these two functions on the iPhone 3G and iPhone 4 by clicking on the button and reactivate with another click.
The decommissioning of the two functions can be used to save (just) in terms of performance and battery life.
zToggle is available for free on Cydia.