I got really sick of the fact that a 0.3 second failure of my wireless caused my iDisk to go offline completely, requiring restarting the Finder and waving a chicken to get it to wake up again. You can fix this, it turns out, by sending an alarm signal to the mirroring agent program.
Since many of you do not want to open the terminal or find out about the killall command or any of that crap, I made a very small Automator app that prompts you to make sure this is what you wanted and then forces the mirror agent to fire up and sync the disk. After that it will show as online just fine.
Nice bug, Apple. Real nice.