http://www.mediatemple.net/services/web_hosting/as/features-options-prices.html

Anyone have any experience with them? www.k10k.com and others use them.

Don't know anything about them personally, but their special offer looks pretty attractive (free setup plus 25% discount on entire hosting service).

Also, make sure you read this:
Media Temple's Appliance Server technology uniquely "slices", or "partitions" a physical Linux server into multiple isolated Linux servers on a single machine. Unlike competing "virtual servers", Media Temple's Appliance server completely isolates each server, or "slice" in it's own memory, disk, cpu, and network space. Hence, each individual server, or "slice" is guaranteed machine resources that can not be used by any other server, or customer. Just like a dedicated server, each Appliance has it's own independent root-level operating system that can be completely configured and controlled directly by the server owner.