OpenEXR image format
OpenEXR is an open-source release of the image file format used by ILM (LucasFilm's visual effects arm) for storing digital film images. It looks to be a VERY interesting format, purported to offer higher dynamic range and color precision than existing formats and multiple lossless compression algorithms. This is the format ILM has used when creating effects for movies like Harry Potter, Men in Black II, and Signs.