I like how the first two responses answer the thread but sad defenders of the dieing 16:10 keep voting for it anyway.
We get it. 16:10 is a better desktop resolution. Who wouldn't prefer 1920x1200 over 1920x1080 for your desktop? It is objectively superior.
However, we are talking about gaming. There are few, if any, games optimized for 16:10. 16:9 usually gives you the same vertical viewing area but superior horizontal viewing, making it objectively better for gaming. Most older games are optimized for 4:3, but this hasn't been a fact for several years.
Those of you with 1920x1200 monitors should voluntarily play in 1920x1080 and accept the black bars. It's not a lot of black bars, but that extra horizontal vision can get you more kills in FPS.
Personally I use a CRT and game at whatever aspect ratio I please.