Please let me promote my idea for a geocoin. You can see plenty of examples at Geocoinshop.de. Imho this is the perfect add-on to a tshirt. Of course the shirt is a must and its something everybody has a use for. But it's nothing "special". Nor is a cap nor a usb stick nor a bag nor a mug special. But a geocoin is something you pretty likley haven't gotten before. If you are not into geocaching then a geocoin is basically a nice medal with a maemo/summit logo and a unique id. If you are into geocaching you already know what a geocoin is good for. Also if anybody is willing to make a nice design for the summit i'd be thankful. Currently i am thinking about one with the maemo.org logo (in while/orange) on a medal made of dark grey metal. But that's of course missing the amsterdam/summit relationship. So a better design is sure needed.