Today I created an account with Dropbox and installed both it's desktop and Iphone applications. Dropbox gives you storage space on it's servers to create folders and allows you syncranise between your applications and the Dropbox server.

You can also set folders to share and invite others to share them. So if you have files that are to large to email you can drop them into your dropbox folders and allow others to download them. This is one of many examples of what is now being described as Cloud Computing.

To take a look for yourself I have included a link to their site.
http://www.dropbox.com/