Paul Hilder, ‘Open Parties? A Map of 21st Century Democracy’, discusses alternative possible future organizational forms.
Peter Mair, ‘Democracy Beyond Parties’, Center for the Study of Democracy, University of California, Irvine, 2005. Discusses the changing politics of the party.
Giovanni M. Carbone (2007), ‘Political Parties and Party Systems in Africa: Themes and Research’, World Political Science Review 3(3). A recent attempt to systematize African political parties.
Contains a wealth of information on US party funding.