Box.net – Virtual Storage Space
Box.net is free for 1 GB of storage space.
The interface is user friendly. It has a good set of features like
* Set up subaccounts for multiple user access.
* Store files which needs to be accessed from any location
* Hassle free sharing.
* A Firefox extension – A button in your browser to quickly access your Box.net account at anytime. Download the extension here
BTW currently Box.net registration is closed.