Why this website? Because startups are the future. Not only because they develop innovative products and services, it's also about the way they develop products and services and manage their company (lean).
An other reason to start this website is collaboration. Do what you're good at and outsource the things you're bad at. A lot of big companies can learn from and (should) work with startups.
A third reason for building this website is crowdsourcing. Crowdsourcing innovative startups and making transparent who is sharing ideas gives us interesting information for marketing, product development, sales, etc.