DropSpace is a little Android app that makes Dropbox on Android work like Dropbox - that is, you get real folder synchronization in the background.
When you run the app you're prompted for your Dropbox credentials. After logging in to Dropbox, you get to select which device folders you'd like to sync to the cloud. It's a straightforward mapping process: You select a folder on the device, and then specify where in Dropbox it should go.
The interface is rather clunky, at least for now. The biggest annoyance is that you can't edit your "sync list": if you add a folder and then wish to remove it, you must delete the entire list of folders and start over.
In terms of functionality, it works quite well. I tested it with the camera folder, and it was nice to be able to take my photos using the lean default Camera app and have them sync up to the cloud instantly.