Useful online mind maps

While surfing internet, I get to know about some good readymade mind maps. Here are the links of them...
1. On Pythagoras theorem http://agutie.homestead.com/files/pythagoras/pythagoras_proof_mind_map.html

2.Geometry help
http://agutie.homestead.com/files/mindmap/geometry_math_com_help.html

3.Euclid's elements
http://agutie.homestead.com/files/mindmap/mindmap_elements_000.html

4.weblog
http://agutie.homestead.com/files/mindmap/mindmap_blog_weblog.html

5.Optical illusion
http://agutie.homestead.com/files/mindmap/optical_illusion.html

Mindmap Instructions:
To see a note, hover over a note button above.
To Fold/Unfold a node, click the node or right click a Node and select Fold/Unfold all from Node. To scroll the mindmap above, drag the map's background and move it around, or click on background and use the arrow keys.
To link to another page, click a link button above. Buttons above: Search, Go to, Zoom in or CTRL '+', Zoom out or CTRL '-', Reset (center), Shadow On/ Off, FreeMind, BG color.