Pressbox « WordPress Plugins. I wanted to build this myself all the time, but now it's already available. I could take a look at it - with this you can select images from Dropbox and insert them into posts. Since I'm using Dropbox a lot for images, this would be quite practical - but I first have to check if the image is then brought to the WordPress server, or if it remains on Dropbox - I want my media files to be on my own servers.