Just when you think it can't get any better it does. Still in Beta form this web and iPad app, Popplet, can be used by submitting a request for an invitation. You will receive an access code by email which enables you to register using your first and last name, your email address, that becomes your username, and a password. Users must be 18 years or older. The site proposes to be the best app for visual ideas; see what you think together. If you are into mind mapping and pictorial brainstorming than I can think of no better app to use at this time. This leaves the other boards in the dust combining text, drawings and images.
Once you have logged in and opened a board to create a popplet the steps (opportunities) are easy: double click to add a popple which can be resized by clicking and dragging or moved by dragging it; type text in the popple; change a popple's color; set a popple's text by selecting one of 3 sizes; draw in a popple; or add an image from Flickr, Facebook, YouTube or your computer.
Once created your popplet can be shared by posting it on Facebook or Twitter, emailed, via a link or embedded in a blog or website.
http://popplet.com/app/#/12808 (My simple beginning popplet)
Collaborators can be added to any popple by adding their name or email address.
Another neat feature is a bookmarklet can be added to your browser's bookmark board where you can clip images and text from other web sites to add to a popplet of your choice.
Check out this video created by the Popplet people that gives you a quick overview.