Skype app for iPhone and iPod Touch has been updated to version 2.0.1 with Multitasking enabled for iOS 4. With the new Multitasking feature you can receive Skype calls and IM while the app running in the background even when the iPhone is locked.
What’s New In Skype 2.0.1
Run Skype in the background with multitasking in iOS 4.
Receive Skype calls and IM while other apps are running or when your iPhone is locked. You can also continue your call while you switch to another application.
Multitasking is available only with iPhone 4 and iPhone 3GS.
Download Skype 2.0.1
You can Download Skype for iPhone and iPod Touch from the App Store for Free. [iTunes Link]