French blogger Bernard Notarianni mentions in a post comment an interesting personal wiki system, ConnectedText, which he uses for his own GTD implementation. This fascinating programme, unfortunately only available for Windows OS, offers a specialised plugin for gtd. Right clickers out there, this may well be up your street. 
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sort of liek mindmap ?
Dear Anonymous, this is what this screenshot looks like. I have however not tried it yet, as I use a Mac at home. I shall try it when I am back at the university after the vacations.
Thank you, good info