[RFD] Visualizing matrix questions in results of "Git User's Survey 2010"

The results of "Git User's Survey 2010" (without analysis or tabulating 'other, please specify' responses) are available at GitSurvey2010 page:

  https://git.wiki.kernel.org/index.php/GitSurvey2010

There are even beginnings of visualization (plots of histograms of answers). And there lies the question: how to visualize 'matrix' type questions?

Survs.com "Analyze" page provides one solution:

  https://www.survs.com/results/33Q0OZZE/MV653KSPI2
  http://tinyurl.com/GitSurvey2010Analysis

(check for example table for question 20).

I have created another at

  https://git.wiki.kernel.org/index.php/GitSurvey2010#20._In_your_opinion.2C_which_areas_in_Git_need_improvement.3F

What do you think about it? How should we visualize results of those kinds of questions on GitSurvey2010 wiki page?