Gamestop.com's Call of Duty: Modern Warfare 2 listing now includes minimum system specifications for the PC edition of Infinity Ward's military shooter sequel (thanks Joystiq). Here goes:

Hard Drive Space: 16 GB free hard drive space
Operating System: Windows® Vista/XP
Processor: AMD 64 3200+ or Intel Pentium® 4 3.0GHz or better
RAM: 512 MB RAM (XP) / 1 GB RAM (VISTA)
Video Card : Shader 3.0 or better 256 MB nVidia® GeForce™ 6600GT / ATI® Radeon™ 1600XT or better