This is the Arduino Uno R3, mother of all duino's. The most used board in the family. Starting with arduino, this is your board!
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No drivers needed for Linux or Mac (inf file for Windows is needed and included in the Arduino IDE)
The Uno Rev 3 adds SDA and SCL pins next to the AREF. In addition, there are two new pins placed near the RESET pin. One is the IOREF that allow the shields to adapt to the voltage provided from the board. The other is a not connected and is reserved for future purposes. The Uno R3 works with all existing shields but can adapt to new shields which use these additional pins.
Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The open-source IDE can be for free (currently for Mac OS X, Windows, and Linux).