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This app has been on the Apple Store for a couple of years now, and it has finally made its way onto Android.
The theory with the app is that it prevents the usual extortion that occurs through purchasing time on wifi networks by allowing you to use Skype credit instead.
Each session is set to last for only 30 minutes, no charge is made for data used, and Skype claims that the prices are much lower than usual rates.
But don't bother looking for coverage map on the Skype site — it 404ed.
In Australia, you can get access on Tomizone, WLAN, iBahn, and FON wireless hotspots.
As for the rest of the world, we have no idea. Good luck!