FMR Eyetrack is a SPM plugin that allows to directly estimate the point of gaze from the functional MRI data without the help of a dedicated eye tracker. At the moment SPM5 and SPM8 are supported.
What does that mean? It means that you can estimate where the subject was looking at directly from the functional BOLD image data of your MR scanner! This even works to some degree on old data sets (quality of estimation depends on actual eye movement).