If you have a google mail (GMail) account and you use Firefox (why not), you can install an extension called "GMail Space" or GSpace. From the authors' description:

"This extension allows you to use your Gmail Space (2.5 GB and growing) for file storage. It acts as an online drive, so you can upload files from your hard drive and access them from every Internet capable system. The interface will make your Gmail account look like a FTP host."