This weekend Japanese elections took place. for background information on the electroal system and previous results see the IPU website. also useful is this guide from UC Irvine which directs users to sources of data on past elections
The Japan Real Time Blog (from the Wall Street Journal) - posed the question of why they matter. Read the answer and further discussion on the blog
The University of Warwick also has some discussion
other useful think tanks which discuss and have full text papers on Japanese politics include:
East Asia Forum - from National Bureau of Economic Research
ISN Zurich has articles on Japanese politics and security
CSIS - Japan research
Council on Foreign relationsBrookings Institution Japan research
The Harvard Business school has a Japan research center which focusses on economic issues.
Pew Research Center has some recent polls on attitudes in Japan.
Japanese press discussion of the same issues can be found on
Real Time Politics.jp