Gamespy has a column about Japanese games. This week it's about game genres that are unsuccessful outside of Japan. It mentions dating sims, management sims (which is odd as they are are pretty popular in Europe), vehicle sims (again odd, as it is a lucrative niche market in the West - although I admit that the Tokyo bus game I saw in an arcade in Tokyo shows a deeper level of interest), pet raising sims and voyeurism games.

(From Slashdot Games.)