Okay, on features, spot the difference between the Optio S40 and the
Optio S4i (in some accents, these could sound identical - way to go
Pentax!). As far as I can see, the 40 is a revised 4, and the 4i is a
new camera.
http://www.dpreview.com/news/0402/04020206pentaxoptios4i.asp
http://www.dpreview.com/news/0402/04020205pentaxoptios40.asp
http://www.dpreview.com/news/0402/04020204pentaxoptio30.asp
--
Kristian