Current Web 2.0 sites allow for user contributed content, including media content such as images and video. many of the existing sites, such as youtube and flickr, moreover, offer APIs to use and store content by means of web services. Mashups allow for quickly developing prototypes, incorporating web services, that in it self may act as media portals, providing web services to for other communities. Many interesting sites of this type are developed in the domain of cultural heritage, in particular historical musems and museum of contemporary art.