iPhoto has been updated with two features called "Faces" and "Places." Faces, as you may have guessed, lets you tag photos by subjects' faces, similar to what Facebook and Picasa have done. iPhoto makes its best guess as to the identity of a subject based on previous tags and asks for confirmation. Of course, Phil called it "..the best technology we've found for face detection."
Places allows for geotagging of photos. Some cameras and the 3G iPhone will use GPS information to tag photos on longitude and latitude. iPhoto then organizes those photos by location, or "place." Also, Flickr and Facebook support are built-in. Those without GPS access can retro-tag photos by hand.
Other iPhoto features include enhanced slideshows and travel books.
Click below to read more about iLife '09
Update: Reader Lou purchased iLife '09 today, and says his receipt shows a ship date of Feb. 09.
For full Macworld Expo coverage, bookmark the TUAW Macworld Expo 2009 landing page. If you missed our liveblog coverage, you can review it here.