From their press release:
SAN FRANCISCO, California - January 12, 2007 -- At Macworld today, BitJazz Inc. announces the imminent availability of the Mac+Intel and Mac Universal Binary editions of SheerVideo™, their acclaimed cross-platform powerful real-time lossless software video codec. Introduced in 2003 as the fastest video codec in the world, SheerVideo lets users work twice as fast at half the uncompressed file size, with perfect fidelity to the original video and digitized film. The ultrafast nondestructive power of SheerVideo saves time, space, and money in professional video and film production and archival workflows, while faithfully preserving every single bit of image information.
editors's note: Haven't used it myself