Launchpad build-farm

While asking for help for a bug I was triaging someone told me the fix was already being compiled and pointed me to the information page of palmer. I knew Launchpad offers a service to its users to compile a package for them, but that is was this big… Look at the list of the Launchpad build farm!  There are a lot of (virtual) servers, ready to compile your code. If you click at a busy server you can even see it’s compiling status. It’s a part of the PPA Launchpad introduced a while ago. You can upload your source code to your PPA, it will be compiled and even offered in an APT repository! I’ve never tried it, although I’ve used PPA repositories, but from what I’ve heard it is a great thing.
I think Ubuntu also uses it, for the main repositories.