...is a collaboratively edited site for problem solvers/inventors - regardless of problem or field.It sounded eerily familiar to something Chen Shapira linked up here awhile back, Project Euler.
We are a bunch of math enthusiasts who decided to create a framework for submitting and solving problems. However, the framework is not limited to math problems, any problem, puzzle, or trivia question can be submitted to project Eureka. Similarly, for people who prepare for various tests project Eureka offers the possibility of grouping multiple problems in a test
If you get a chance check it out.