iPhoto '09 adds the following updates:

* Faces: with the addiction of face detection to iPhoto '09, you can more easily organize your photo library by the people in it. After identifying a person and inputting their name, iPhoto '09 will be able to identify them in the rest of your library. The Faces feature also generates a corkboard-style view of snapshots of the folks in your library.
* Places: the takeaway point here is built-in support for geotagging, so you can organize your photos around where they were taken. Google Maps is also now built in to the application for displaying photo locations. GPS geotagging is increasingly supported by new digital cameras on the market as well as by a number of cameraphones including the iPhone 3G. iPhoto '09 will now take that data and show the latitude, longitude, and even place names like the Eiffel Tower example shown. For photos taken by devices that don't support geotagging built-in, you can also add locations to your photos from within the application. You can browse photos by location using the same interface used in iTunes to browse album artwork or artists.
* Facebook and Flickr support: photos you tag on Facebook or Flickr will send the tag data back to sync with iPhoto '09.
* New slideshow themes: with the ability to save slideshows directly to iTunes as well as save as a video files for the iPhone or iPod touch.
Source(s):
http://www.obsessable.com/software/iphoto-09/


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