Good news, crofflr just passed the Dropbox review process. So it's time for a new feature: Dropbox integration.
When you connect your Dropbox account in the crofflr configuration, crofflr will upload all your e-books (in the mobi format) also into a special app folder in your Dropbox. Use it for archiving or reuse with other ebook readers. Have fun with new feature and happy reading.Best, Michael