this is great, i just wish there were solutions! I personally (and i think many other students agree) rather to invest my study time only on problems which have

this is great, i just wish there were solutions! I personally (and i think many other students agree) rather to invest my study time only on problems which have solutions. i think an approach like stackoverflow.com would be a nice idea, where anybody can ask question and then have the privilege to flag the correct answer. or maybe a reference to the textbook which problem originally came from could be provided if you are planning to only create the problems yourself in the future.