Mailing lists provide probably the most important point of collaboration for Linux developers. Often projects are developed by contributors who live far apart, possibly even on opposite sides of the globe. Mailing lists provide a method for each developer on a project to contact all the others, and to hold group discussions via e-mail. One of the most famous development mailing lists is the "Linux Kernel Mailing List", which is described at http://www.tux.org/lkml/.