Here are links to some relevant information and news.
Circumcision
Study concludes that circumcised men have reduced prostate cancer risk
Should You Circumcise Your Baby – NY Times article
Pollock Technique™ Circumcision Training in Haiti with celebrity guests
Vasectomy
Large Study Finds No Link Between Vasectomy and Prostate Cancer Risk
Vasectomy and Prostate Cancer Incidence and Mortality in a Large US Cohort