Basically as per my idea(what I want from such sites), the focus should be on - 1. Validating and improving the idea through feedbacks, discussions, brainstorm

Basically as per my idea(what I want from such sites), the focus should be on - 1. Validating and improving the idea through feedbacks, discussions, brainstorming, etc. 2. Maintaining a wiki/document repository for idea and its execution related planning i.e. Feature List, Designs, Marketing Strategies, Technical Architecture etc. 3. Connecting various people who can execute the idea through some startup or may be an open source project - Developers, Designers, Entrepreneurs etc. This can be done through twitter like system "Follow Idea" as "Developer/Designer/etc" 4. Encourage those who implemented the idea to share it with group. The system should improve the raw idea to an extent so that it can be practically executed by those who are interested.