I would say that a lot of women who don't consider themselves to be feminists at all are often closer to radical feminism than to liberal feminism. A lot of the everyday concerns of many women, about poverty, the value of their unpaid work, the treatment of their children, support of other women who are in difficult circumstances are issues of radical feminism. Liberal feminism sits more comfortably with women who have found ways of individually getting on within the system. That is why its ideals get a lot of focus in women undergraduates and women starting out in the professions, because they are at the time in their lives and of a class position where many of the concerns of women are less likely to have happened to them. Of course there are some feminist issues that have a huge impact on them, and those are often the ones all feminists tend to unite over as a common goal.
Contributing to that is the removal of radical feminist thought from university courses, from reading lists and discussion topics and promotion of consumerism and individualism in contemporary society.
In terms of porn culture, I think that is generational. The current generation in their twenties have not grown up with their whole childhoods being surrounded by porn culture and so don't react to it as strongly as either many women raising teenagers, or females who are not themselves adults yet. The impression I get from teenage girls is that they have strong negative emotions about porn culture, but don't frame it as a feminist issue. A lot of them aren't seeing it is an issue of gender, but one of feeling angry and let down by adults as a group for creating, perpetuating and controlling the sexualised culture they've grown up in. I think feminism is going to change a lot as those teens and pre-teens get older and have more of a voice. Some of those people are already starting to speak up, which is why feminism is growing, but I think it is a shame that it takes things getting worse to make people act collectively. It reminds me of those left wing men who say it is a good thing when things get bad because that creates a revolt. It is all very well if you are not the person who is on the receiving end of the bad things!
Kim, I may be misunderstanding you, but although there is a radical feminist conference, many of the radical feminists attending will also attend general feminist conferences as well and be involved in more general forms of activism, both in feminism and in other political areas.