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This gallery view lets you scroll through all the photos in a folder (galleries are only created if they're in a subfolder of the Dropbox Photos folder. You get a different view (and the ability to get a link) if you click to open a photo file directly from the file listings. That view doesn't include the row of navigation thumbnails shown here.
Dropbox is pushing its photo features hard, offering free, automatic storage upgrades if you upgrade lots of photos.
If you share a folder with another person, its contents sync to their computers, and they have full read-right access to everything in that folder. You can use email to invite another person (they have to have a Dropbox account), or you can pick from a list of Facebook friends.
To grant read-only access to files and folders, use the "Get a link" options. Anyone who accesses the files using that link can make a copy, but can't change the contents of the original file or folder.
SkyDrive's file and folder listings are much more dense with information than their Dropbox counterparts. You can filter the list, showing only photos or documents, for example, using links in the left pane.
The information under the Shared With heading makes it easy to see whether a folder is public, shared with some people, or completely private. Those four small icons above the Files list--Word, Excel, PowerPoint, and OneNote--offer a hint of what's supported in the Office Web Apps.