Teachmate.org, Now OpenSource
Teachmate.org has open up it's doors and made the website's code opensource. Teachmate is about offering your knowledge to become and online teacher and/or to find people who would be willing to train you in a particular field, check it out: Teachmate. As far as I'm aware, this is one of the few actual websites where they have made their code opensource - this can only be a good thing for the web community! I found this through the ruby on rails google group.