Thunder

Over the weekend I stumbled across MindMeister, this website brings online collaboration to mindmapping/ brainstorming.  More details can be found here.  The free version only allows you to store 6 maps, contains some advertising, and there is the ability to export the map as an image or rtf file (for use in Word etc).  If you are feeling flush you can go for the premium edition (€3.10 per month) this removes the limit on maps and allows more export functions including the ability to include the mind map on your blog or website.