Apple introduces new features to iPhoto ’09 such as Places and Faces.
Faces automatically scans iPhoto library right after the upgrade, and it might take a while to process all the data. I have 3368 of assorted pictures in my iPhoto Library, and I’m looking at a good 80 minutes for my 15-inch MacBook Pro Core Duo 2.0GHz to process Faces data.
I’m going to post some screenshots from faces, if I remember to.