Optical Image Stabilization appears to be the most effective type of Image Stabilization.
This type of image stabilization became popular for lenses with longer zooms.
If you hand hold a camera with a 10X lens, you are likely to get a blurred photo due to camera shake.
Because camera shake is amplified by 10 as well as the image.
A tripod is the best solution for camera shake.
But many situations will not let you use a tripod.
Another method is to use the camera viewfinder instead of the LCD.
A camera pressed against your face will help steady the camera.
In addition, lean against a wall, doorway, tree, pole, etc to further steady yourself. Using these methods you can easily take a 10X photo with no blurring.
Two outstretched arms, while using the LCD, invites even more camera movement.
As cameras get small and lighter weight, it is even more difficult to hold the camera steady. A large heavy DSLR camera is much easier to hold steady than a small camera that can fit into your pocket.
People wanting to use a digital camera in low light (no flash) is probably the biggest cause for blurred photos with the small pocket size cameras. To shoot in low light conditions, the camera must choose a slow shutter speed to get a proper exposure.
When the shutter speed drops below 1/60th of a second, camera shake is likely to cause blurring.
Image stabilization can help at 1/30th of a second and even likely to be effective at 1/15th of a second.
Any shutter speed below that needs a tripod.
Just wondering.... It is nice to have IS on a camera, whatever its form. However, as camera shake goes from slight to heavy, how will IS deal with the problem ? Surely, you cannot set the shutter speed to 1 sec. and expect IS to help you take a good picture. So, what is the threshold of shutter speed for IS to work properly ? Thanks.