Skype
Skype's app for iOS has been updated and it now supports the new 4-inch Retina Display featured on the iPhone 5. The update also enables iOS users to integrate their Microsoft account with the contact list of the VoIP account.
The feature which merges your Microsoft account with Skype contacts will enable users to send instant messages and also call people from their Outlook, Messenger and Hotmail contact using Skype.

One can now edit instant messages simply by tapping and holding the text. There are a bunch of new smileys and animated emoticons which use the Retina Display. These features have already been present on the desktop and Android version of Skype