Dropbox to be your server!
We generally use Dropbox to share files with friends and business partners. I have never used Dropbox as a server. However, when I was looking for a mechanism to produce mobile compatible resource taht can be accessed without login, option of using Dropbox was investigated.
Justin, in the Screenr explains how this can be done (http://www.screenr.com/wcA8). Also, Nancy in elearning heros explains how people are using Dropbox for sharing learning resources, as well as an e-portfolio where files can be uploaded and shared (read more).