GMail has about 3 GB - you could use it like a drive

You can use it on your computer by installing an application that will do to access the drive easier, or you could use it from the net.
The first method is very easy to use (too bad you can't see the drive in Total Commander, but the Windows Explorer will do). You just have to:
1. Download the GMail Drive shell extension 1.0.10 from here.
2. Extract he files from the archive and run setup.exe
3. Access the new drive in Windows Explorer - it will ask you to log in (you know that Windows Explorer is something like Internet Explorer but with some other default tools, so when you copy files on that drive you just upload a file into an email sent to you, and when you copy from it you just download that file, so don't expect extra speed).
Look at the tips on the download page that I gave you above. It is nice to put a filter to your uploaded files.
Here you can see a little illustration how it works:


The method number two:
But sometimes you want to access your files not only on your computer, but somewhere else, at school, where you have no time or will to install that application. You can use this page witch is user friendly, and uses the same GMail. It is xMailHardDrive page powerredby BlackBox.
I saw this site is in the beta version, and sometimes you need patience with it. This guy from the clip above say that is is ok. It wasn't for me...

If the second method doesn't work, try downloading files from your GMail inbox (that's kind of third method), that sure will work, it will be just harder to upload files, but for that you better use the first method from home, where you have the drive installed.