I have a Kyocera Finecam S3. It has 3.3 mega pixel resolution and a reasonable optical and 2x digital zoom. I chose it because it was far and away the smallest of the 3.3s.
The drawback is that becasue of its size it cant take a microdrive and it uses a proprietary battery which doesnt last for hours becasue it is so small.
A colleague has a Canon G2 which is a lovely bit of kit but is about 3 times the size of my Kyocera.
Guess it comes down to what you want, portability or features, and then price.