When Google released the Nexus 4 three months ago, they also announced an official wireless charging orb. The charging orb is available in the US Play Store for $59.99 and availability says it will ship in less than a week.
The charger is based on the QI standard, and the charging time is said to be approximately 4 hours. The device is still usable while charging, which is a great thing.
The app on the picture is Battery Widget? Reborn!, a very nice and popular battery widget. It is available in the Play Store as a time limited Beta, and the full version is available for $1.99/€1.99.