The mind mapping element of Popplet is the option to connect your notes. To do this just click one of the small circles that hovers near your note (Popplet calls them "Popples") while you're editing. Click those small circles will launch a connected blank note that you can edit.
You can create as many Popplet walls as you like within your account. Each Popplet that you make public can be embedded into your blog or website.
Applications for EducationPopplet could be a great way for students to create multimedia collages of information they find about a particular topic. That collage could be transformed into a mind map by using Popples that are connected to each. For visual learners this could be a good way to outline an essay by using a combination of their own notes with images and videos they find on the web.