The new version of MindVisualizer has many new features inlcuding being able to attach any type of existing files such as Microsoft Office documents, image files, text files etc to a topic as an attachment.

Other interesting features such as freehand topic image drawing, free topic positioning, curved text and the use of a 'home map' for managing documents. Worth a look if you are interested in a feature rich, relatively low priced product.

There is a portable version of MindVisualizer available now.