I tend to keep some files that I need access to from different computers on my .mac iDisk account, when on a windows computer Apple has a utility to mount the file system, but when using Linux (Ubuntu in my case) your out of luck.
But luckily iDisk is just a webdav share so mounting it is pretty easy.
Firstly do a
sudo apt-get install davfs2
This will install the required utility to mount webdav file systems.
Then fire up your favorite editor and edit
And ad a entry like this
http://idisk.mac.com/username USERNAME PASSWORD
to mount the file system manually type
mount -t davfs http://idisk.mac.com/username /mnt/idisk
That’s it, your ready to go.
If you like to have it automatically mounted when booting you have to edit /etc/fstab and add
http://idisk.mac.com/username /mnt/idisk davfs user 0 0