Recently , Zack, from an original idea of Jorge, asked the project whether it makes sense to have a debian instance of Shapado (a free software web application for question and answer support for our users). The idea was well accepted and http://ask.debian.net showed up quite quickly.
More recently, I stumbled upon an article which announces the birth of the pretty same service but for Ubuntu users (in partnership with Canonical, Ltd.). It was known for some time as http://ubuntu.stackexchange.com. Then, it was redesigned (I guess) and offered a new domain name. The service runs Stack Exchange which is like Shapado but closed-source. It even runs on Windows Server and .Net. Admittedly, there is also http://ubuntu.shapado.com but it doesn't seem very active (nor seems to be supported by Canonical).
In 2 days timeframe, both distributions gained the same service but they did it quite differently. I found this chain of events quite funny. And, really, I'm quite happy to be on Debian's side (as always) :)