Kyrgyz is a Turkic language spoken in Kyrgyzstan and a few other areas. While both the Arabic and Latin scripts have been used to write it in the past, Cyrillic is now the standard. The alphabet is essentially the same as Russian but with 3 additional characters: Ң, Ү, Ө.
OS X comes with fonts that cover Kyrgyz, but with no keyboard layout. On my iDisk you can find two versions: KyrgyzCYR, which is the same as used on Windows machines, and KyrgyzPH, which is modeled on the Apple Russian-Phonetic layout and may be easier for people used to QWERTY. The extra three characters are found on the Option and Option + Shift levels for н, у, and о.
Switching from Cyrillic back to Latin (which was used for a number of years before 1940) is reportedly being considered.