Updated Skype ver.3.5.454 is live now at App Store that works for iPhone 4S, iPhone 4, iPhone 3GS, iPhone 3G, iPad 2, original iPad, iPod touch 4G, and iPod touch 3G.
Skype v3.5.454 for iOS is integrated with improved stability for iOS 5 and bug fixes.
Download Skype v3.5.454 for iPhone
Download Skype v3.5.454 for iPad