Thinkcycle - Idea open source forum seeks to create a culture of open source design innovation. - http://www.thinkcycle.org/home
Idea A Day - A new idea every day. - http://www.idea-a-day.com/
Halfbakery - A communal database of original, fictitious inventions, edited by its users and spanning many topics. - http://www.halfbakery.com
Creativity Pool - A global pool of innovation and new ideas. People can browse the database and search for creative inspiration, or donate their unused creativity and be rewarded. - http://www.creativitypool.com
Global Ideas Bank - An International Suggestion Box for socially innovative non-technological ideas and projects, with £1,000 UK sterling awards annually for the best ideas or projects submitted. - http://www.globalideasbank.org/