Cameras the size of the SD1000 are considered to be Ultra Compact Cameras.
I see no difference in the photos from the SD1000 and the SD1100IS.
The Image Stabilization of the SD1100IS is an advantage, because cameras of this size/weight are notoriously difficult to hold steady.
To my eyes, both camera could benefit from having a tad more image sharpening. They could have done this in the firmware of the camera.
But since they didn't, you could use any photo manipulation software to add a bit of sharpening if you think it needs it. I tried Irfanview free software on some sample pictures from both cameras and it added that extra sharpness that I like.
You might also look at the Sony W120. It has image stabilization too.
I thought the sample photos from the W120 were better than the images from the W130. (The W130 has one more megapixel but does not benefit from it).
The Sony cameras have a bit more optical zoom (4X).
I'm looking for a compact digital camera for my wife. She wants something to carry in her purse, with a low shutter lag (I think that's what it's called - the time between pressing the button and the camera taking the shot). She takes a lot of pictures of our dogs, and it's difficult to get the shot she wants because they move before the camera captures the scene. A lot of the pictures are indoors also, often requiring a flash. I've been looking at the Canon SD 1100 IS, although CNET has said last year's SD 1000 may be better. Any thoughts on those two, or any others that will meet our needs? Thank you.