There are two new entries in the list:
ImaginationCubed: This is collaborative hand-drawing web-based software from G.E. that could conceivably be used for mind mapping. It is flexible but, as it’s not mindmaps-aware, it is cumbersome for mind mapping.
WriteMaps: This is a web-based, on-line tool for planning web site maps (not mind maps). It allows only a strict hierarchy. Unlike some on-line diagramming software it makes good use of a large screen working area. It works with Firefox only, at present.
As this shows hierarchical maps and can also display the planned web site as an outline, I felt it just about made the cut for inclusion.