Neglected diseases, differential pricing and drug patents

Nature had some interesting articles on incentives for development and distribution of and access to drugs for neglected diseases in a recent edition. See in particular:

Neglected Diseases: At what price? by Patricia M. Danzon

Neglected Diseases: The road to recovery by Carlos M. Morel et al

and

Neglected Diseases: Patent sense by Paul Herrling

Thanks to Thiru Balasubramaniam via the A2K list for the pointer.