Creative has revealed its Xdock HD, a new iPod dock designed for use with a home theater system. Optimally, the Xdock HD connects to a home theater system via HDMI, or it can be connected with component or composite for video and analog line-out or optical line-out for audio. The Xdock can upconvert iPod video to either 720p or 1080i, and also features the ability to output DTS surround sound as well as the ability to wirelessly play music through…