With so many possible sources, we have narrowed it down to two websites:
Canadian Urologic Association - Patient Information
Urology Care Foundation - from the American Urologic Association
For those with an interest in guidelines, here is an excellent link for healthcare providers.
Canadian Urologic Association Guidelines (link)
Excellent, well written pamphlets covering many areas - including BPH, stone prevention, and many more (easy to browse). Highly recommended!
Up to date guidelines - directed to physicians usually but can be helpful for those desiring more detailed information.