I use Picasa for most of my photo managing/editing, and as mentioned in a earlier post, I use picasa web albums to backup my photos to the cloud. Besides acting as a backup location, web albums offers other great features such as the ability to share whole photo albums, order prints, and view other photos from around the world. The latest feature added last week is quite impressive: multiple users can collaborate on a single photo album. Imagine taking a trip to LA with a friend, instead of creating two separate albums by two separate users stored in two separate locations (on the web), a single album stored in a single location (on the web) can be created and both users can add photos to it. This could work very well in the classroom. For example, a group of students that completed a field trip could create a single photo album with captions and geotagging. Each one could add their favorite photos to the album. This is truly a great feature and expect the social networks to adopt it soon.
Visit here for details of this feature.