Hi Freemanjr! I can't directly answer your question, but I think you can get dropbox from the enTourage store or the Amazon appstore directly to your eDGe, and it will then work with the dropbox on your phone. Maybe someone who actually uses dropbox can confirm/correct this.

Unfortunately, I am having trouble accessing both Amazon and enTourage stores from my PE at the moment, so not sure how much help I'm being. ;(