iOS 4 introduced application backgrounding which made multitasking possible. Most reliable apps have been updated by their developers to support this iOS4 Native feature. However, there are still lots of apps, that don’t have it supported by default, here is a neat trick to make restricted apps run in background & Multitask.
Go Native is a Cydia based tweak that is neater than “backgrounder” app, since it lets apps multitask natively.
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 your springboard, but it’s configurable through the Setting application on your iOS device.
You will, of course, need to have a jailbroken iOS 4.x iPhone, iPad or iPod Touch.
Go Native is available via BigBoss repository for free.