Duplicate ical alarms using external boot drive

I have an external firewire drive that I boot Leopard from. I carry it between home and work. At both home and at work I have similar, but not identical Mac Pro (Intel) desktop machines that stay put. In either location I can just boot from my external firewire drive and have all my OS environment and files with me. I've been doing this for months.
Every since I've set it up, though, I have had a problem with iCal alarms. If an iCal alarm goes off, say, while I'm using my external HDD at home, and I dismiss it, it never shows up again at home, even if I reboot. But if I then take the HDD into the office and boot from the external HDD there, all the alarms that went off and were cleared at home, show up all at once when I boot up at work. It also happens in reverse -- alarms cleared at work show up the next time upon boot at home. Note that I'm running from the same boot disk in both cases. I don't sync multiple calendars with .Mac.
This is particularly annoying because I have some automator ical scripts that are triggered once/day and if they run at home late at night, I don't want them running again when I boot up the next morning at work.
Anyone know a fix/workaround for this. I searched the iCal prefs, iCal help, this discussion list, and did a google search to no avail.

You can use the hardware, but will have to repartition and reinstall the OS from the disk shipped with the new Mac Mini.
http://docs.info.apple.com/article.html?artnum=303220
If you create a disk image of the Lacie on your Mini, you can later use setup assistant to restore users and applications from that image.

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