It's Apple Style

Skype ha updated it's iPhone app to include support for the multitasking capabilities of iOS4.

The new update will help the user to now accept Skype calls and instant messages while running other applications, as well as switch to other tasks while using Skype.

As with all iOS4-compatible apps, users will need to run Skype in the background to take advantage of multitasking and allow for incoming calls.
The other update includes the enhanced graphics supported by the iPhone 4’s Retina Display.