What's is Mobile High Definition Link (MHL) ?

Mobile High Definition Link (MHL) is a new standard that allows to connect your MHL-enabled phone to an MHL-enabled device (e.g. a TV) to output video, connect power and allows communication between both device with only one cable (micro-usb to HDMI cable with MHL signalling).
The MHL Consortium has just been setup last year by Sony, Toshiba, Samsung, Silicon Image and Nokia.

The MHL™ Consortium is committed to enhancing the multimedia capabilities of mobile and portable devices. MHL specification version 1.0 is an HD video and digital audio interface for connecting mobile phones and portable devices to HDTVs and other home entertainment products. It utilizes established connectors and features a single cable with a 5-pin interface, supports 1080p HD video and digital audio, and simultaneously provides power to the mobile device. It also enables the TV remote to control the mobile phone and access its contents.

They have a few devices that will be MHL compatible soon, but the only device that has officially been annoucned that support MHL is the Samsung Galaxy S2.

Read more: http://www.cnx-software.com/2011/02/18/mhl-mobile-high-definition-link/