Although the iWear AV310 Widescreen from Vuzix isn't the first 3D
HMD we've come across, or the largest virtual display
(likened to a 52" screen viewed from 9-feet), it's the first 16:9 widescreen version to hit the market. Equipped for use with both NTSC and PAL, this unit will run you about $250 and has a mysterious "video" input for use with a wide range of devices, though there's currently nothing to say what style of connector can be used or what resolution it runs at. Oh well... we're still waiting on a headtracking
As a commenter pointed out, this likely isn't the first "widescreen" HMD, though the company is claiming it's the first 16:9 model.