Ones to watch

• Admob
• Adjustables: Targeted Ad serving on video
• Big Think
• BoxedUp - Del.icio.us for products
• Brickfish - engagement via User Gen ads
• Cambrian House (crowd-sourcing ideas into money)
• Current TV
• Cyworld (US version of Korean Myspace killer)
• EI42: affiliate your friends
• Elastic Lab crowd-sourced video projects.
• Fanista; friend-recommended purchasing
• Flixya: Social media - shares all revenue with co-creator
• Flektor - digital creation made easy
• Google's socialstream project
• The Gorb
• Habbo Hotel (now a global phenomenon)
• JotSpot (now google owned)
• Kyte: mobsoc with mobtv broadcast
• Lilgrams: Twitter for toddlers parents...
• Live News Cameras (fox project)
  
• Mechanical Turk (crowd-sourcing HiT tasks)
• Meshopolis - free long-tail e-commerce
• Mippin (mobilizes content)
• Nokia Ad Service & Gateway
• Ohmynews (English)
• Open ID
• Orkut - Social Networking site with 32m members
• Orb Networks
• Predictify (uses crowds to predict outcomes)
  
• Qode
• ScanScout (incontext ads for video)
• Suggestion Box
• Viddler - rich video community
• Seedcamp - start-ups galore
• Seesmic
• Shoppero - Long-tail reaching prosumer site
• Spigit: The Game of start-ups
• Swarm Teams
• Tipped.co.uk
• Trutap
• Twine
• Twitter
• Twhirl
• Wink.com (people search)
• Wunderloop: Behaviour targeting
• Wishood.com; ultimate wishlists
• Xtract
• Yahoo mobile ads service
• Zenzui - personalised mobile navigation

Your suggestions welcome - as is your assistance in weeding out ones that are no longer worth watching... please post in comments below.