I've complained several times since Dropbox updated their client that the new UI is lacking in one significant respect: the number of recent files shown is only 3, and that is not configurable in any way:
For someone who uses Dropbox for actual work, this is laughable—if we're away from our computer for a few hours, a dozen or more files could easily be uploaded or edited. Even if we don't have to take action on those files, it's good to stay up to date on what's going on.
If you're using OS X, the best way to do so is to set up a Smart Folder. Mine uses the following parameters:
Open the Finder and select your Dropbox folder, then hit File -> New Smart Folder.
Personally, I want to see anything updated in the last 24 hours, so I select the option of "Last Modified Date" and set it to "Within last 1 day." This also will display files that were created within the last day, as well.
Then click Save, and be sure that the "Add to Sidebar" option is ticked.
BTW, if you'd like to tell Dropbox that you want more recent files, I started a thread about this on their feature request forum a few months ago.
Any other things you do to make Dropbox more productive for you? Share 'em in the comments!