From Canon's press release dated 22nd July 2009:
Canon Inc. announced today the development of Hybrid Image Stabilizer (IS), the world’s first* optical Image Stabilizer which compensates for both angular camera shake and shift camera shake. The technology will be incorporated in an interchangeable single lens reflex (SLR) camera lens planned for commercial release before the end of 2009.
This is quite a significant development given that existing Canon IS lenses include technology first introduced in 1995. It has of course been refined significantly to sense shake more accurately and to be able to improve the level of stabilisation. This has helped us take clear, unblurred shots in lower light, use the camera handheld more often and, with the stabilisation now fitted to some of the bigger lenses, take clear pictures that just could not be taken of some sports and wildlife.