I’ve been keeping track of a number of companies who provide virtual server hosting based on Solaris Zones.  Since we occasionally get asked about this, I thought I’d share my personal list.  This is not an endorsement of these businesses.  In the interest of full disclosure, I was once taken to lunch by David and Jason from Joyent.  Sorted alphabetically:

• Avantic Software ("OpenSolaris on Coolthreads")
• BeaconVPS ("Affordable, High Quality Solaris VPS")
• Entic.net ("v.Dedicated Servers")
• Gangus Internet Services ("Virtual Servers for Hosting")
• Joyent ("Cloud Computing with Joyent Accelerators")
• SparseZone ("Superuser control over your own Solaris 10 server, without the hassles
  of hardware, OS and software maintenance.")
• Stability Hosting ("Ruby on Rails / Java Application Hosting on Solaris 10 Zones")

I’m pretty sure this list is incomplete.  I’ll try to keep it updated as I learn more.  Feel free to post (or send me) corrections and additions, and I’ll add them.

Finally, if you are a hosting provider, and want to consider adding zones to your suite of offerings, we’re more than willing to talk, anytime.

Update #1: Added Gangus and Layered Technologies.
Update #2: Removed Layered Technologies (we’re not sure); added Stability Hosting
Update #3 (6/30/2008): Added Beacon VPS (confirmed by email with Beacon)