Check the tag CLOUD STORAGE.
Box.net is offering 50 GB free space for lifetime on logging in/registering from your Android device using the Box.net Android app till 23rd march, 2012. In order to mount box.net space on Ubuntu try the following (worked for me on Ubuntu 10.10):
# apt-get install davfs2 # mkdir /mnt/box.net
Edit /etc/davfs2/davfs2.conf and add
at the end and save.
# mount -t davfs https://www.box.net/dav /mnt/box.net
Enter username and password to mount. I did not find any speed issues. Enjoy!