This is the first video found showing the iPhone OS 4.0 multitasking between applications. Check out the mini icon bar on the bottom. The ALT+TAB has arrived iPhone owners, and you only have to “wait till the summer” to get in on the action. Shown is the 3GS developer’s beta, did ya only wish you were a developer now?

Along with Fast app switching, Background audio is going, VoIP, Background location, Push notifications, Local notifications, Task completion are added to the list of multitasking features.

The second video below (in polish) shows the dashboard interface for Fast app switching.