Canon makes several series of non-SLR digital cameras; each line of cameras begins with a letter-number designation. The A series is the entry-level tier; they're the least expensive but they also lag in features. The Sx00 Elph series is the most compact. The Sx series is mid-tier—larger and more powerful. The G series is the top: it has a lot of the EOS features but lacks interchangable lenses.
Another gift from one of my aunts. I didn't even know I had it until I was looking through a box of odds and ends and found it. I can see why it would appeal to her: it's about the same size as the Digital Elph but a bit lighter and curved to fit the hands better.
The Canon Camera Museum says that it succeeded the A590 from six months earlier; Wikipedia says it has a new, slimmer body design and no manual controls. It also takes AA batteries, which is a nice feature. Canon liked to use their own rechargable batteries on some of these, which was fine until the battery died and you had left the charger at home.
What I find most interesting about this model is that Canon offered it in three colors: brown, blue and purple. I wouldn't have believed the last, and mine is faded, but under bright light the hand-grip really is purple.
Camera manual: Orphan Cameras.com