Here are links to some relevant information and news.
Circumcision
Study concludes that circumcised men have reduced prostate cancer risk
Pollock Technique™ Circumcision Training in Haiti with celebrity guests
American Academy of Pediatrics Circumcision Policy Statement
Vasectomy
Large Study Finds No Link Between Vasectomy and Prostate Cancer Risk
Vasectomy and Prostate Cancer Incidence and Mortality in a Large US Cohort