The feature is likely to be most appreciated by business users, as Dropbox file-sharing has become a very popular way to work around the size limits of email attachments when distributing large presentations.
Dropbox 2.1 also adds better support for PDF viewing, displaying multiple pages on a screen, and file-sorting by date-modified, another feature of greatest value to business users who often deal with frequently-updated documents where it is vital to be working with the latest version.
Dropbox is a free download from the App Store. [Direct Link]
(Image via Cult of Mac)