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."

To use this, you need to sign up for a GMail account, from the google home page, "more," then "even more." Once you have that, you can add GSpace to FireFox by selecting the menu Tools, then Add-Ons (in Firefox 2.0x).

You then access it from the tools menu. You will need to set it up to log into GMail. If you are using someone else's computer, at least set it up with out the password, or use it and then remove both user name and password.

What can you do with Gspace? You can use it as a virtual USB drive, uploading data from one location and then using it from another. Once you open up a GSpace session in your browser, you will see local folders and your virtual GSpace folder. You can make sub-folders and do other typical file management things. Behind the scenes, the Space utility is uploading and downloading attached files into your GMail account.

If you work remotely, you may find handy is encorporating it into remote support sessions. You might need this if the remote support technology available to you does not include file transfer. GoToMyPC always has file transfer, but LogMeIn only has it if you use the Paid, "Professional" version. Microsoft's Remote Desktop client will have it available only if the Terminal Services server has file sharing enabled. In cases where you need easy file transfer and the desktop client doesn't include it, one handy technique is to open up Firefox on both your local desktop and in the remote session. Then start GSpace in both. GPace (and GMail) will allow you to have two logins at the same time. Then, you can copy a file from your local drive to the GSpace folder, and once there, you will see it (after refreshing) in the GSpace file viewer in the remote desktop, and you can copy it from there. Not quite as straightforward as having direct file transfer support, but often easier than other options (such as mailing it to yourself from webmail or using traditional FTP).

Another use would be to create a GMail account you share with a team of people. Then use GSpace as a shared file folder.