game logs for analysis
I have been collecting these for ages now but nobody really knows about them:
http://arcturus.su/tenhou/gamelogs/houou/
It's all the game logs of all the houou games ever played (including the very frist two, played by me, almost a month before houou was made public). You may also find some of the stuff up a directory useful:
http://arcturus.su/tenhou/gamelogs/
Enjoy.