Popplet is an easy-to-use mindmap generator that creates slick conceptual maps. Add images, change the colour and embed your results on your blog or webpage. There is even a "play/presentation" feature that makes your Popplet work like a Prezi. Creations can be exported as image files. Worth taking a look at.
(Psst: It's also available for iPad in a lite version (free) and a paid version that allows you to create multiple boards, not just one.)
Here's a short Youtube demo.
Here's a sample project (Embedded version below)