AppleInsider has posted that iPhone OS 4.0 will support multitasking for third party applications, and allow users to switch between applications using a Expose like interface. The new OS will also bring global mailbox support in Mail application and ability to add individual contacts to the iPhone’s home screen, such as a button that will call “Mom” or “Dad” directly.

AppleInsider wrote “Those familiar with the design of iPhone 4.0 said that the user interface will resemble Apple's desktop Expose feature, in that a key combination -- reportedly hitting the Home button twice -- will trigger an expose-like interface that brings up a series of icons representing the currently running apps, allowing users to quickly select the one they want to switch to directly. When a selection is made, the iPhone OS zooms out of the Expose task manager and transitions to that app.”

Multitasking for third party applications has been the most requested feature for the iPhone. The current iPhone OS is fully capable of supporting third party multitasking, but Apple has artificially restricted third party apps from running in the background. Switching on multitasking for third party apps is not the real challenge for Apple. However, developing an efficient method to manage system resources after some user has started many applications is the real problem. We believe Apple will start supporting multitasking for third party apps on iPhone once they have found an easy and efficient solution for the problem. We don’t think Apple will offer crude solutions like manual management of system resources by a user, as are now offered by Android and Windows Mobile.

Check out the video below it shows multitasking concept, which is similar to tabs in Safari browser on the iPhone.