Here are some companies that are working together with OpenVZ project in one or another way. Feel free to add your company profile here (in alphabetical order).
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Computer Tyme
Computer Tyme is using OpenVZ for their spam filtering service Junk Email Filter dot com. They are active proponents of OpenVZ; Marc Perkel worked at the OpenVZ booth during LinuxWorld Expo 2007.
LastSpam
LastSpam offers managed e-mail security services (anti-spam and anti-virus/bad content) and uses OpenVZ to deliver excellent service and support to its customers. Ugo Bellavance, LastSpam's head server architect and manager is an active member of the OpenVZ community: helping on the forum, making suggestions, and submitting patches.
netVOICE communications
netVOICE communications is an Internet Telephony Service Provider (ITSP) that uses OpenVZ as the basis for their Virtual Private Asterisk Server (VPAS) offering. They also offer consulting on running Asterisk (the leading Open Source telephony platform) on OpenVZ. netVOICE is a Digium Approved Reseller and has a Digium Certified Asterisk Professional (dCAP) on staff.
Proxmox
Proxmox is using OpenVZ for their spam filtering appliance (see Proxmox Mail Gateway in VE). Proxmox is also the author of vzdump utility.
SpiderTools.com
SpiderTools provides training for OpenVZ servers. Students work on live servers to gain skills on how to implement OpenVZ. 20% of all sales go back to OpenVZ for development. Students will get 6 weeks of live instruction and support.
Thomas-Krenn.AG
Thomas-Krenn.AG is a server specialist, selling server systems and solutions. One of the solution products is a pre-installed cluster system, built with Virtuozzo. They published how to build such a cluster with OpenVZ at HA_cluster_with_DRBD_and_Heartbeat.
VPSLink
VPSLink.com provides virtual private server hosting on the OpenVZ platform.
GleSYS Internet Services AB
GleSYS is a hosting company specialized in serverhosting. Also offering VPS hosting mainly based on OpenVZ. GleSYS has provided access to hardware for developers from OpenVZ to find problem with VLAN implementation.