Ask any of my family or friends, and they’ll tell you that I always recommend Picasa to help manage pictures and Picasa Web Albums to help share them. Only problem was Picasa was only available on Windows and Linux. Well now it’s available on the Mac platform as well!
Additional Info: http://googlemac.blogspot.com/2009/01/picasas-macworld-debut.html
First Look Review: http://lifehacker.com/5123996/picasa-for-mac-beta-released-first-look
Download here: http://picasa.google.com/mac/