I would love to see it. Even if it just starts out by cachers locating them and inputing them. Many cachers can find out data on caps themselves, even if the entire database is not availiable at this time. There could be a possibility of contacting each province to start with. I believe that many provinces integrate national control benchmarks into their own network. It's a start... Being from Alberta, I use the SPIN system to find Alberta Survey Control Markers. As mentioned by PDOP, I can also use the Canadian Spatial Reference System Online Database (CSRS page) to access data for National benchmarks.