This idea has a larger than usual chance of being crushed by competition. Normally I wouldn't be bothered about the risk of Google/Microsoft stepping into my m

This idea has a larger than usual chance of being crushed by competition. Normally I wouldn't be bothered about the risk of Google/Microsoft stepping into my market. (In fact, Microsoft are already in my market.) But in this case: - They have access to more data than you. A lot more. - The product is bang in the middle of their core competence. They love automated data analysis. One of their engineers would probably hack up a competitor at the weekend for fun. - They already have a low-friction way of trying out ideas with Gmail (labs) which would help counter the usual large-but-slow competitor disadvantage. I've been considering building things on top of Gmail, but because of the above I have decided that if I do it'll be limited to products that Google doesn't seem to like. (And/or hobby projects for my own amusement.)