People's Collection Wales / Casgliad y Werin Cymru at the National Museum in Cardiff. (The official launch is due to be in August 2010.) The website includes tours as well as the ability to add data.
One of the aims of the project is to put objects residing in museums back into the spatial contexts. The Collection is far more than archaeology but we were reminded by one of the participants that "History is Hot".
St Davids Head, Pembrokeshire © David Gill