The Sony Ericsson Yari will definitely surprise you with its optical tracker technology. This feature, developed by GestureTek, can make use of Yari’s built-in 5 megapixel camera to sense your movements and render them into game moves. Yari is also capable of wireless multiplayer gaming.

The features of Sony Ericsson Yari include 60MB integrated memory, QVGA video recording, Bluetooth 2.0 with A2dp, a GPS receiver that has A-GPS support, and as mentioned above, the gesture and motion-based gaming technology.

The Sony Ericsson XPERIA X1 boasts its TFT resistive touchscreen and its Qualcomm MSM7200 528MHz processor. It has HSDPA, 7.2 Mbps; HSUPA, 2 Mbps 3G feature and a 3.15 MP, 2048×1536 pixels, autofocus camera. Actually, this smartphone was released last October 2008 in the US but it’s worth posting it here because the Sony Ericsson XPERIA X1 was a hot topic in the recently concluded Mobile World Congress convention in Barcelona, Spain. By the way, the Sony Ericsson XPERIA X1 is the first ever Sony smartphone that is built with Windows Mobile platform instead of the Symbian OS which is Sony’s standard platform.