The International Dupuytyren Society site contains everything you want to know about Dupuytren's disease, including symptoms, treatment options, related diseases, research, and links to other useful resources.
The Dupuytren Foundation is a US site that has a simple mission statement: to promote research, education and global collaboration to find a cure for Dupuytren's disease.
Reference
Book published by SpringerLink: Dupuytren’s Disease and Related Hyperproliferative Disorders (Principles, Research, and Clinical Perspectives), Authors: Charles Eaton, M. Heinrich Seegenschmiedt, Ardeshir Bayat, Giulio Gabbiani, Paul Werker and Wolfgang Wach. ISBN-10:3642226965; ISBN-13:978-3642226960; also available as an ebook.
Keith Denkler MD (US surgeon) useful website on Dupuytren's and different treatments with photo's. The page linked to contains lots of useful information about treatment with Xiaflex.
Two new clinical trials on Xiaflex, comparing manipulation to use of a dynamic splint, and using autologous lipografting
Research paper: Late Complications of Clinical Clostridium Histolyticum Collagenase Use in Dupuytren's Disease (Warren M. Rozen, Yasith Edirisinghe, John Crock)
Percutaneous needle fasciotomy for Dupuytren's disease: report on a randomized clinical trial and related research, (2012) Rijssen, Annet Laura van. This thesis contains an excellent and up to date summary of the available clinical treatments for Dupuytren's.
NewReport on Needle Aponeurotomy for Dupuytren Contracture in over 1,000 fingers, finding that PIP joints are more difficult to correct and have higher recurrence.