Non-Destructive Marginalia, as an app and web service, aims to allow users to annotate any physical object e.g. books, CDs, store fronts etc. The idea is that each object (even copies!) is given an unique ID to which users can attach any form of data e.g. text, image, audio etc. We hope to be able to capture the user's experience or engagement with the object, share it with others and also link to other annotations of similar objects.