It certainly is in the 2008 NEC.
(A) Dwelling Units. All 125-volt, single-phase, 15- and 20-ampere receptacles installed in the locations specified in (1) through (8) shall have ground-fault circuit-interrupter protection for personnel.
(2) Garages, and also accessory buildings that have a floor located at or below grade level not intended as habitable rooms and limited to storage areas, work areas, and areas of similar use
The requirement for GFCI receptacles in garages and sheds, as illustrated in Exhibit 210.10, improves safety for persons using portable handheld tools, gardening appliances, lawn mowers, string trimmers, snow blowers, and so on, that might be connected to these receptacles, which are often the closest ones available. GFCI protection is also required in garage areas where auto repair work and general workshop electrical tools are used.
Exhibit 210.10 Examples of receptacles in a garage that are required by 210.8(A)(2) to have GFCI protection.
The exceptions to 210.8(A)(2) have been deleted from the 2008 Code, to ensure that all 125-volt, single-phase, 15- and 20-ampere receptacles installed in garages provide GFCI protection for the user of appliances or other equipment regardless of where the receptacle is located in the garage. Appliance leakage currents permitted by today's product standards are far less than the operational threshold of a GFCI.