I’ve been using bubbl.us for a wee while now, and I’m very pleased with it. A lot of my reflective though is probably easier to capture in this way than through short essays and the like alone, so I’m glad to have a good brainstorming tool like this. Here’s a version of a conceptual framework idea I’ve been working on for a bit. Click and drag to move around the  framework, use the + and – buttons to zoom in and out. Bubbl.us is free, by the way.