Just got back from the Opensource Hardware Summit and I have 20 Hackerspace passports that I picked up from +Mitch Altman. These passports can be used while you are visiting other hackerspaces around the world. You simply bring your passport and have the hackerspace stamp it. Simple! These are very new and not all hackerspaces have stamps just yet but you might as well get your passports now! I will be bringing a stack of them to the Hive on Tuesday. They are $3 each (This is the price I paid for them) I should have enough for anybody who is interested.
More info on the passports can be found on adafruits blog.