Ask HN: Mind map like tool for information organization?

I love mind maps. However, most tools are somewhat restrictive or "slow" when adding anything other than plain text. Is there any tool that works better with different media? I'm not sure how to put it into words, but I envision a blank canvas like Prezi (at least when it was launched) where you can structure information with mind maps, add snippets from the web, plain text or even videos/images almost like you have an infinite sized table and you lay down all information you have, but in a digital format. It also has to be searchable and potentially offer some sort of outline based on the information you have to easily glance at structure? My intent is to document ideas, tasks, and information that serves as reference.