Cybersalad.net has been providing Linux-only hosting since 2000. Since 2003 we have been using Debian for all new workstations and servers.
Debian's support for a vast range of development environments was a primary factor in our decision. Other major factors were Debian's open and prompt handling of updates, its superior package management system, and its solid history in the Linux community.
In Debian we've found the best balance of stability, flexibility, and usability available.