Some visualizations for these polls:
Age (bar):
http://hn-stuff.appspot.com/poll_chart/build/?thread_id=2175...
Region (bar):
http://hn-stuff.appspot.com/poll_chart/build/?thread_id=3298...
Primary OS (latest), pie:
http://hn-stuff.appspot.com/poll_chart/build/?thread_id=3786...
Build your own: