Dropbox

Dropbox is a free online storage website that allows you to store your files without worrying about losing your USB flashdrive.  You can use it as a web based storage space, simply logging into Dropbox to retrieve your files and/or loading it on certain computers where the files will be automatically synced everytime you make a change to a file.  I use this almost everyday.  Go to http://www.dropbox.com/ to watch the promotion video that shows how it works.