Box.net is a file hosting service for individuals and groups. They've got a really great customizable widget you can put on your blog or Web site that lets you share files with anybody. Even better, the Box widget provides instant previews of images and music. The files reside in your Box.net storage area, which provides its users with 1GB of free storage and more with paid plans. As the widget owner, you can even upload files through the widget, without having to manage things at Box.net. It doesn't get much simpler.