MindMaple also allows you to attach files to and insert photos into your bubbles and control the features with touch, mouse or keyboard. Even as a seasoned user of Inspiration, I sometimes get stuck reformatting and re-dragging bubbles, and there is a definite learning curve for our students.
MindMaple is a paid software, but there is a free version, called MindMaple Lite. I look forward to downloading this to my own iPad and exploring it for next year! I'm always looking for ways to use those new iPads!