A 21:9 display offers a 2.33:1 aspect, and is closer to to the "cinematic" movie aspect ratio of 2.78:1. This will result in lower black bars for movie watching. It also provides a wider aspect for gaming.
Even if you aren't a fan of multi-monitor gaming (Eyefinity & Surround), the work of the WSGF helps to ensure that games on these single ultra-wide monitors would be Hor+. It's aspect ratio is only slightly narrower than a 5x1-P Eyefinity setup of 2.8:1.
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Tags: hdtv, ultra-widescreen, monitors, ces