I recently bought one as a wedding present for my wife (:)). She loves it! It's easily the smallest Canon point and shoot. She's been using it for our entire honeymoon (ending in a couple days) and has easily carried it around when she just takes a small purse with her. She informs me that:
- the zoom is good
- the manual features are limited - it's "one step above 'point and shoot for dummies'"
- not bad video quality
- short shot-to-shot time
- menus are easy to navigate with well-placed buttons
- basically it's good quality for such a small camera

Looking at the other Canon models, the SD1000 is the best way to go if you want good quality point-and-shoot shots from an extremely compact form.

Oh, and I've used it a couple of times and agree with her assessments. I also had the SD630 (with the 3.5" screen), and find the 2.5" screen to be plenty big.

So that's an endorsement from the wife and I!