After a string of leaks and rumors, Google has announced the Nexus S smartphone today. The device runs on a 1 GHz Hummingbird processor, which is the same CPU as found on the Galaxy S, and features a contoured display. Along with WiFi, Bluetooth, accelerometer, gyroscope, GPS, proximity sensor, digital compass, light sensor, 512 MB RAM, and 16 GB of internal memory, the device will also come with support for near-field communications, or NFC, which will be instrumental into turning phones into digital wallets for mobile payments. Also, the Nexus S will feature a front camera along with a rear camera capable of 720p HD encoding and 5-megapixel digital still capture with LED flash. The Nexus S will be available in the U.S. through online and via Best Buy stores for $199 on contract or $529 contract-free and will debut with Android 2.3, also called Gingerbread. In the UK, the Nexus S will arrive through Best Buy UK and Carphone Warehouse on December 20th. Google has set-up the official page for the Nexus S at google.com/nexus.