iPhoto was introduced in 2002 on January 7th for Mac OS X 10.1. The iLife suite came later and included the second version, released on January 3rd, 2003.
Seven more releases would follow, bringing us to today's iPhoto 9, included in iLife '11.
iPhoto is often noted as the basic version of Aperture, Apple's professional and comprehensive image manipulation program; this is much like the relationship between iMovie and Final Cut Pro.
iPhoto 9 is available on the Mac App Store for $14.99.