Pitch.tv – mobile social network
Helio – social networking enabled phones
Twitter – A global community of friends and strangers answering one simple question: What are you doing? Answer on your phone, IM, or right here on the web!
Threadless – t-shirt designs submitted by users, rated by users, bought from the site
BarCamp – ad-hoc, self organising conference
programmable web – resource site for web based APIs
Getting Real – an online book from 37 Signals
Powerset – natural language search which runs on Amazon services

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