Sorry for keeping silent. Recently I am busy on another N900 application , FrontView . (More function should be added , but I gave up finally) In fact, in my original plan , what I want to implement is a handwriting task list management and a brainstorming tool (not exactly a mindmap , but have similar function) . After a full day of work, I changed the mind , make a sketch book first. As the interface is more simple , and the developed module can be reused later. Therefore , I prefer to keep the interface of PenPen Sketch Book as simple as possible. Optimized for note taking , and then create another software (e.g PenPen Brainstormer? PenPen Tasks?) for task and mindmap. well, 3 ppl voted for this feature.. any more? noted