Go Native is a new free tweak which has just been released. It allows you to run specifically those applications in the background natively on applications that don’t support it yet. In a way it is an alternative to the tweak Backgrounder.
One important thing to note is that this tweak only supports iOS devices that support native multitasking, so devices like the iPhone 3G are not supported. This tweak does not add any additional icons to you SpringBoard, but it’s configurable through the Setting application on your iOS device.
You will, of course, need to have a jailbroken iPhone or iPod touch to install it. The Go Native app is available from Cydia under the BigBoss repository for free.