The 2.5-inch LCD is on the small side, but that's a given if you want to retain an optical viewfinder. The screen gets hard to view in direct sunlight, though bumping up the brightness helps a bit. Its colors look very saturated, though, and it offers a relatively wide viewing angle that should deliver a good group-viewing experience.
Overall, the SD890 IS' photo quality just tips over the fence from above-average to excellent, mostly because of the great color and usable high ISO shots under many conditions. It's not the best lens--the photos generally look a bit soft and there's some fringing on edges--but the camera renders good exposures with accurate, saturated colors. (Click through the slide show for more details on photo quality.) It captures very nice 30fps VGA movies--at a file size of almost 2MB per second, it had better--but you can't zoom the lens while recording, which seriously decreases the usefulness.
I miss Canon's traditional if-it-ain't-broke-don't-fix-it approach. There was very little wrong with the SD850 IS; while the PowerShot SD890 IS delivers a decent shooting experience, it can't escape the shadow of its more talented older brother.
(Shorter bars indicate better performance)
(Longer bars indicate better performance)