Here are two more you can add to your looking list:
Canon S500
Olympus Stylus 500
For something more advanced - check out the
Canon S70
...
..
.
I have been looking for a digital camera in $300-$450 range. My requirements are simple
1. Good Image quality
2. 5-7 MP
3. 3+ opticle
4. Portable (Not 1/2 Lb)
5. Automatic (Wife needs to use it too)
6. Need to buy from Dell (I have service credit there)
7. Good Brand (Canon, Sony etc)
I looked at SD400 and W5. For both, I couldn't see any reviews. SD400 looked too small(?). W5 uses AA batteries so its useful if I go to other countries.
I haven't ruled out other cameras. Also not sure about large zoom cameras. Please advice...

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic