Fraps

Fraps is a universal Windows application that can be used with games using DirectX or OpenGL graphic technology. In its current form, it performs many tasks, including benchmarking screen capturing (take a screenshot with the press of one key, with no need to paste into a paint program every time you want to capture; your screen captures also are automatically named and time-stamped) and real-time video capturing (record audio and video while playing your favorite game at up to 1,024x768 resolution at 30 frames per second).