I just wanted to add a couple links to those already listed by Mini, Eats and probably a few others above related to the concept of Intersectional Feminism. It is perhaps more recognised in the context of North American feminism and women's struggles in developing countries, which may be why at least in my experience, it's misunderstood amongst many European feminists.
The roots of the concept were founded primarily amongst feminists of colour who felt that none of the other "strands" of feminism acknowledged their experience of both institutionalised sexism and racism, and in some instances, they felt their concerns about racism within the women's movement were not heard.
In time, Intersectional Feminism came to include the need to recognise the specific experience of those who experience more than one form of oppression (not just racism and sexism.) In addition, the experience of a person at that "intersection" itself can be unique and not just "sexism with an added helping of racism," for example. So, it's something like a venn diagram - a disabled woman may experience some of the same forms of oppression as a non-disabled woman and some of the same forms of oppression as a disabled man, but also oppression FROM both non-disabled women and disabled men AND forms of oppression unique to her specific experience as a disabled woman.
Intersectional Feminism recognises that all individuals and groups experience both oppression and privilege and social, economic and political justice can only be achieved by acknowledging and addressing that interplay of factors. It also recognises that the mechanisms of oppression are often similar, even when used against different groups of people - e.g. women, Lesbian, bisexuals and gay men, disabled people, working class people, migrant, people of colour, people of differing faith and cultural backgrounds, transgender, older people, younger people, etc. Examples include things like demeaning language, limiting their economic opportunities, exclusion from decision-making, threats, violence and abuse.
This wiki entry is a bit dry and focusses on Intersectionality as a broad concept - not just related to feminism, but the links particularly to the work of Kimberle Williams Crenshaw, Patricia Hill Collins, Audre Lorde and bell hooks are very useful.
This article also explains the links between Anarcha Feminism and Intersectional Feminism.
This is a short, accessible description of the views of a woman who describes herself as a [http://life-tbd.tumblr.com/feminist radical, intersectional feminist of colour], to give an idea of how this perspective translates to the beliefs of one intersectional feminist.
Hope that's helpful to those interested in exploring the different strands of feminism.