Primal Fusion is a technology rather than a product–the site isn’t even in beta yet, and although you can sign up for an account, you may have to wait to get access. Here’s how it works: You start by typing in keywords that the system uses to search Wikipedia (by default, because it’s a good source of concepts and related ideas). Rather than results, this gives you a “tag cloud” of ideas and concepts. Pick the ones that fit your interests and add them to your “remembered thoughts.” Switch to other sources like Flickr and Yahoo (there are only a handful of sources at the moment) to get results matching these concepts. The ones you choose to remember add new tags to your thought network and you can keep searching and refining the classifications. Stream of consciousness, anyone?