Curved screens are often used with very large projection screens to better focus light and provide a bit of a wrap-around effect. When you use a computer, you are sitting very close to a monitor so a 48" monitor looks huge and thus there is some wrap-around benefit.
What doesn't make any sense are wrap-around 48" or even 75" TVs sitting 10+ feet away. My 92" flat screen at 9 feet isn't neat large enough to switch to a curved screen and thus the concept on small TVs was and is ridiculous.