I just stumbled across an article from Mobiletor.com about a Dropbox client for Symbian^3 devices developed in Qt. Yes, your dreams have come true. cuteBox, which is available in the Ovi Store, is a must-have for Symbian^3 users, as it is able to upload to and download from Dropbox, view photos on your Dropbox in full screen with Symbian's built-in photo viewer, open HTML documents, PDFs, spreadsheets and documents in their native applications.
Also, just like all the other Dropbox clients, you are able to copy the public links of files in your Public folder for sharing (sharing inside the application is limited to email and SMS). Also, bulk operations are available, such as copy, move, and delete, just in case you need something in a public folder, or to take it out of the public eye. Adding files does not take long at all. I was able to upload a high-res image from my N8 and copy the public link in less than 15 seconds.
The user interface is very fluid, all the buttons and menus are easy to use as well as easy to press. Transitions are very snappy and smooth, and scrolling through long lists of files is very easy. The upload menu is straight-forward, and none of the notifications that pop-up are intrusive of the main view. The application uses a mock-up of a status bar (with time, battery, and data connection indicator) but is not an interactive status bar.
One small quirk was backing out of a file info page. By selecting a file, it automatically retrieves it (which can be changed in the settings) and gives you a few options: open the file in an application, share the file via email or SMS, and copy the public link (if it is in the Public folder). There is no option to delete the file when viewing info on it. You have to back out by swiping left to right, and then selecting the bulk operation icon, selecting the file you want to delete, pressing delete, and confirming your delete. I like the ability to check multiple files, but when I want to copy, move, delete one file, that process takes just as long. Backing out a file view, again, is a swipe, so there is no "Back" button to get back to your file list view. You do have a home button to take you back to the top directory, but that only shows up in the file list view, not the file info view.
All in all, this was a much needed application for Symbian, and although I have only used it a few minutes, I find it very easy to use, functional, and from what I can tell, Genera Software spared no expense in creating a very good Dropbox client for Symbian.