En effet a partir du 20 février 2008 vous pourrez via le Market place ( compte silver suffit ) vous pourrez telecharger des videos au GDC 2008 .

source : http://www.xboxlive.fr/news_affiche_6934.html

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En plus des trailers, les clients Gold pourront aussi downloader des images, interviews, DEMOS (j'insiste >.<) du GDC

"Additionally, footage will include never-before-seen gameplay, demos, screenshots, game trailers and interviews from the GDC show floor. These additions will enhance Xbox LIVE Marketplace’s growing library of premium entertainment, which already equals more than 3,600 hours of total downloadable content (HD and SD). Xbox LIVE Marketplace is the leading destination for downloadable HD movies and television content."

Source: http://www.xbox360achievements.org/news/news.php?id=730