2x10 technology is now available in SRAM's X7 line. 2x10 technology gets rid of the largest chainring and, in place, adds another cog to the cassette making it ten gears. This enables the rider to have more efficient gearing and, therefore, a more efficient and pleasurable ride.
This was a perfect replacement for my Rocky Mountain Slayer. Fitment looks so much better then the original 3x derailleur installed, though it did require some modification to make it fit.