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/

Enterprise Linux Support  
   Linux support for businesses, including systems administration, software development, and integration. (United States)
   http://e.linux-support.net/

TeleDynamics Communications  
   Linux networking support, including system security, web management, and web hosting. (Canada)
   http://www.teledyn.com

Linux Services  
   Provides Linux configuration, installation, support and training to businesses.
   http://www.adroitsys.com/

Pantek  
   Telephone and on-site support. Online knowledge base.
   http://www.pantek.com/

Linsup - Linux and Computer Systems Support  
   Linsup provides IT planning, installation, and support to small and medium sized businesses.
   http://www.linsup.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/