projectEUREKA

An old friend of mine who I worked with on Oracle a few years back has, with some friends, just launched a new website, projectEUREKA

...is a collaboratively edited site for problem solvers/inventors - regardless of problem or field.

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

It sounded eerily familiar to something Chen Shapira linked up here awhile back, Project Euler.

If you get a chance check it out.