Also, I've been thinking of this for a while, but Project Euler needs to be open-sourced. I think this would help people who don't necessarily want to contribute money. I thought rather than just making suggestions, I could make a pull request for implementing OAuth/Persona/OpenID login -- then I realized it wasn't open source...

I've been keeping this idea close to the chest, mostly because it's something I want to do, but Project Euler could easily become a great training tool, an easy-to-install packaged django application(I mention django for it's nice out-of-the-box admin interfaces, doesn't matter what it is as long as it's easy to manage for admins and users)