WikiBrains is the search engine for connections powered by the crowds.
Search for a topic and find the most popular associations, connect these or add your own...and more connections will be suggested. Presto! Before you know it, you will have a beautiful map around the topic you were interested on.
Quick tutorial video: http://www.youtube.com/watch?v=0hpaN-sEj0k
Last updated 6 Aug 2015