If you like the P3 and don't need WiFi, get the P4 and save $50
There have been no reviews on the P3 or P4 yet.
But I did find a pre-view at:
http://www.steves-digicams.com/2006_reviews/p4.html
check it out.
...
..
.
I've tested the Nikon P3 and like the Vibration Reduction and WiFi (but don't have to have WiFi) on the Canon I like the wider lense and much more detailed video. I also like the normal view finder in bright light. Leaning towards S80 but can't make up my mind. Any expert advise would be great.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic