Photo Library and editing software for Macintosh: http://www.apple.com/ilife/iphoto/

Free online "lite" version of Photoshop: http://www.photoshop.com

Jim's favorite graphic utility is "Graphicconverter" for Macintosh: http://www.lemkesoft.com/. It opens any format, and can do "batch" processing of lots of pictures at once.