There is a Japanese promotion called "Smack Girl" which has some good competitors. A fair proportion of their matches are more at an amateur level, though. Shooto has a ladies division (G-Shooto) and DEEP runs the occasional women's match. The Hook n'Shoot Revolution DVDs are good. For pure grappling, ADCC just started a women's division, which had some great matches.
The men/women ratio is a big issue, as Ellen said above.