OLED displays are already awesome enough. Here is a foldable one that would even be cooler.

http://arstechnica.com/news.ars/post/20081125-blue-oleds-and-foldable-displays-on-tap.html

Everyone wants a larger screen phone so they can better browsing and user experience, but nobody wants to carry a large phone. Something like this could really change the game.

 Update: Maybe foldable OLED displays will find their way into mobile devices in 2009? Check out these 2009 predictions.