Dropbox's Android client received an update today, adding a few new features to the file-sharing service's mobile software, as well as introducing a new, cleaner (inverted?) logo.
Left: old logo; right: new logo
The newest version of Dropbox now supports direct sharing of files to all of your contacts via email from inside the app, via the newly-added contacts permission. Just choose the share action on a file, hit "send to contact," enter the appropriate info, and Dropbox will send the share link to them immediately.