If you've ever been to a tandem rally and wondered where everyone got that stylish, white tandem image affixed to their window, chances are it was from me. I still have a few of these stylish tandem window transfers (aka. decals) left over from my '03 buy which, coincidentally, will be my last....
The information is here: http://home.att.net/~mark.livingood/...Decalinfo.html
I ended up offering these by accident. I went looking for two of these decals for use on our own vehicles and ended up having to buy in mass quantity to get them. We thought this was a neat and subtle way of letting folks know what those unusual roof racks were for and that we rode together.
Note to Moderators: I posted this here because this is most likely of interest to the smaller tandem cyclist audience.