If you're looking for the ultimate ultracompact point-and-shoot, the Sony Cyber-shot DSC-TX200V is probably it. Too bad its price tag is ridiculously high.
Sony's slimmest Cyber-shot, the DSC-TX66, is a fun and powerful snapshot camera that might be too small and have too many megapixels for its own good.
The fast-shooting Sony Cyber-shot DSC-TX7 is a slick, feature-laden ultracompact, but its price doesn't guarantee perfection.
There's very little not to like about the Sony Cyber-shot DSC-HX7V, as it solves common snapshot camera issues while still being relatively simple and fun to use.
As long as image softness doesn't bother you, the fast-shooting Sony Cyber-shot DSC-TX9 is a quite capable camera for taking photos under a variety of conditions without much effort from the user.
If you shoot primarily outdoors in daytime--especially sports, children, and animals--the Sony Cyber-shot DSC-H7 is a good choice. The more expensive DSC-H9 has a larger, flip-out LCD, infrared shooting, and has a few interface differences, but is otherwise identical.
This snapshot camera delivers a bit more than the basics but offers merely adequate photo quality.