Joerg,
Thanks for posting this. I was JUST thinking about this. Garmin is windows only (Mac too?) but I hate booting into windows just to use it. I will check out your links and give it a go.
In case you need Tux on your panniers:
http://tuxstickers.ptaff.ca/step1/?lang=en_CA
Sent from my HP Pavillion Laptop running Ubuntu Edgy.
No Windows virus here!!!!!!!!!!!!!