ForLinux - Offer installation and support of linux business systems. Based in Nottinghamshire, UK. - http://www.forlinux.co.uk/
Pantek - Provider of certified telephone and on-site support for all Linux software and distributions. - http://linux.pantek.com/
Linux911 Linux-911 support services - Computer network repair company, specializing in on-site, on-line and phone support for Linux. - http://www.linux-911.com/
Linux Services - Provides Linux configuration, installation, support and training to businesses. - http://www.adroitsys.com/
TeleDynamics Communications - Linux networking support, including system security, web management, and web hosting. (Canada) - http://www.teledyn.com
Enterprise Linux Support - Linux support for businesses, including systems administration, software development, and integration. (United States) - http://e.linux-support.net/
Linux Network Care Inc - Both free and commercial support for Linux Networks and lots of information and hot tips about Linux. - http://www.linuxnetworkcare.com/