iPhoto 09 retains the familiar look of iPhoto 08 (and others) so if you’d used iPhoto before this new version won’t be hard to navigate. You’ll notice two new features right off the bat: Faces, and Places. Faces helps you organize your photos based on who is in them. Places helps you organize your photos based on where you took them.
The installation of iLife 09 and the conversion of my existing iPhoto 08 database took over an hour. Not bad. I made sure I had a backup of my iPhoto database before I did the installation, of course. So should you.