An interesting tip I found at Lifehacker: the Gmail Drive shell extension. Now you can use the 1GB of your Gmail account as a normal drive on Windows, using this little app to access it like any other drive on you PC. However Lifehacker warns not to store any sensitive information.
The plus-point: you can access 1GB of your data from anywhere on the web, no matter what internet cafe your sitting in…
And if you don’t know anyone who can invite to Gmail, look at this other tip from Lifehacker.