Crowdcast - CrowdCast provides webinars & virtual conferences.
Spotify - Map shows when two people play same song at same time
WT:Social - A news focused social network from the founder of Wikipedia
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Vidpulse - Analytics and recommendations for all videos on your site
Bideo - A simpler way to get bids from videographers.