ECONOMY 2.0

Many traces of the old "new economy" in this category (where monetization of these initiatives is almost inherently excluded). And as many interesting social and socio-economical experiments:

Aidpage - People help people
Associatedcontent - Produce & publish content, get paid
Billmonk - Manage debts
Boompa - Show your rides & find guides & parts to improve them
Brokenotbeat - Donate to a needy person each day
Castingwords - Get your podcasts transcribed
Cellswapper - Swap out or in a mobile phone contract
Changingthepresent - Invite friends to donate to your good causes
Chipin - Connect, collect & give money
Couchsurfing* - Home swapping & holiday dating
Cucumis - Translate or be translated
Daylo - Contribute to local yellow pages
Democracy2.0* - Consumers/Citizens unite!
Donorschoose - Donate to schools
Dotsub - Help to subtitle films
Elevatorpitch - Upload, read & rate pitches
ESPgame - Label images in a game
Ether - Set up your call center, make money
Eyespot - Edit & remix videos online
Faqqly - Trade Q&A, advice, lend things to friends
Favorville - People helping people
Fundable - Pledge for funding
Gather - Share passions & get paid
Givebobadollar - Begging
Givemeaning - Give or take fundraising community
Givezilla - Create fundraising storefront
Googleanswers - Get your questions answered for money
Grootbedrijf~ - Merge your company virtually with "Big Company"
Helpwinmybet - Help this guy to get laid in a 3some
Homeforexchange~ - Exchange for vacation homes
Humanpages - Add, share & sell your profile
Indiekarma - Pay a cent to see a blog
Interraproject - Do & consume good with your credit & debit cards
Kiva* - Give a micro credit to an entrepreneur from a developing country
Knacktion - Share & sell your talent & content
Knowmore - Consumers unite
Kritx - Social reviewing
Lendmonkey - Trade everything
Listsomething - Share any list to buy & sell things, services
Lostkeys - Lost & found for keys
Mailmydisc~ - Exchange your media
Milliondollarhomepage* - Buy pixels to finance study
Mturk* - Complete simple tasks & get paid
Myfreelanceauction - Buy or sell web services
Nextcat - Platform for entertainment professionals
Nirbi - Find matches for carpooling
Oolsi - Share links to free things
Openstudio - Create, collaborate, share, buy & sell
Pawspot - Exchange pet care
Peekaboom - Label images in a game
Plugim - Submit, plug & share content
Populationone - Your pixel and 6.5 billion other ones
Programmermeetdesigner* - Partner matching for IT projects
Prosper - P2P lending
Qunu - Get or offer help
Rawsugar - Social bookmarking directory & revenue sharing
Readitswapit - Swap books
Resellular - Get out of your cell contract, or take over a contract
Savetoby - Donate or else…
Secondlifeboutique - Buy real things with virtuaa money
Sellaband~ - Promote your music & find 5000 fans
Smarkets - Stock markets for products
Smashmyviper - Buy pixels to destroy car
Splitgames - Trade games (French)
Squadrapiloti - Tell about your car, get matched with other cars
Storycode - Read, code, find & share books
Stuffopolis - Keep track of things you lend or borrow
Superoyster - Sell oe buy your place at a waiting list
Swabba - Online garage sale (German)
Swaptree - Swap your media
Trashbit - Register & share your code
Tree-nation - Plant a tree in Niger
Voices - Market place for voice overs
Votemerich - Blog, campaign, vote & get rich
Zackbookmaps - Locate & lend books (map mash-up)
Zipcar - Share your car
Zopa - P2P banking services

Italic = new. Update 061221, 070119.