VoiceThread: please leave a message about this document, video or image

VoiceThread is an interesting free and premium (user-pay) service that lets users comment on videos, documents or images. I came across it in the April 02009 issue of the Canadian Heritage Information Network (CHIN) Newsletter where there is a link to its use by the Yukon Historical and Museums Association. They are "posting digital copies of photographs at Yukon Archives online using the Voicethread technology. With Voicethread anyone can post text, audio, or video comments on the photographs. It's part information gathering, part story telling, and part community commentary."