Dropbox has updated its file-sharing system to make it easier to share direct links to files inside your Dropbox folders without having to give up access to your account or dump content into your Public folder.
The new system allows you to share a direct link to photo galleries, videos and documents by clicking "Get Link" on any file or folder in Dropbox. The receiver can then check out the link directly in their browser without gaining access to the rest of your Dropbox contents. From there they can view the photo, watch a video or read a document, no download required.
Share your stuff with a link! [The Dropbox Blog]