CNET has published an interesting comparison, they compare the 30-inch Cinema Display from Apple with the Dell 3007WFP.
Until recently, if you wanted a large screen to use with your computer, you'd have to buy a television that doubled as a monitor. That's fine for casual use, but a low-resolution TV is far from ideal for reading text, let alone graphic design tasks or professional photo editing.
When the 30-inch Apple Cinema HD Display was released in June 2004, graphic artists, designers, and others who lusted after a large, high-resolution LCD finally had an option. When Dell released its high-res LCD on the market--the UltraSharp 3007WFP--in January 2006, the heavyweight wide-screen LCD fight was on.