Sony has officially released the promised PlayStation Vita Skype app in the PS Store, a press release confirms. While it's officially out as of today, April 24, 2012, you might not see it listed yet among the store's downloadable offerings. Give it some time; the release notes that it could take as long as 48 hours for the app to spread across the entire network.
For those who have been living under a technology-warding rock, Skype is the Internet's premiere VoIP phone service. For a few dollars a month, you get to place phone calls using your Internet connection. The Vita app offers both voice-only and video chat capabilities, over both Wi-Fi and 3G. The app will run in the background, meaning you'll be able to get calls while you're gaming, switch out to take the call, and then go back to whatever you were playing.