Mind mapping software

I need to create a mindmap for a health issue — something where I can relate symptoms to diseases to indicators to remedies to … I thought about just doing a database app but I’d like to be able to drag stuff around on the screen easily and look at the web of connections.

So it looks like I could use Mindmapper or MindJet or Visual Mind or PersonalBrain or a dozen others — wikipedia lists a kabillion choices. I used Personal Brain years ago and it was ok. It would be awesome if one of these was hosted on a MySQL db so I could also query directly but it doesn’t look like that exists. Maybe freemind is the way to go, exports in a nice format useable by an external php/mysql wiki tool.