To get information about the Kosov@ conflict, apart from the website of WRI, you can check the following:
Women in Black: Documents in English and Spanish from womens point of view.
http://wib.matriz.net
Institution for War and Peace Reporting: Regular reports on the situation in Yugoslavia, many of them from people on the ground.
http://www.ipwr.net
The Transnational Foundation for Peace and Future Research: Excelent reports from the ground, from a pacifist point of view.
http://www.transnational.org