This thread over on the MacNN forums discusses how to mount your iDisk using a terminal session. Why might this be useful? You could SSH to your OS X machine from anywhere, mount your iDisk, and then use cp to copy files from your iDisk to one of your local drives ... with the new "Apple Software" folder on iDisk, this could prove to be very handy!
I've documented the "how-to" in the second part of this posting, but head over to MacNN to read the full details!
To mount your iDisk, you need to have a directory at the top level in which it will be mounted. So from a terminal session, do mkdir /idisk. Replace idisk with the name you'd like the directory to have.
Once the directory is present, you can mount the disk with the following terminal command:
mount_afp afp://user:password@idisk.mac.com/user /idisk
If you name the directory something other than idisk, make sure you change the name in the mount_afp command as well! The forum article also explains how to put this into a file so you can easily mount your iDisk.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20010110172208342