Media Temple has updated their information on the Grid Server. Here’s a little info that’s not on that page.

(gs) Grid-Server Background

(gs) Grid-Server is (mt) Media Temple’s all new, completely re-engineered hosting system designed to replace the antiquated (ss) Shared-Server. Over one year in development, the Grid uses an expert foundation of cluster and grid technology. Based on all new source code, the new zero-downtime system is hosted only in Tier 4 data centers. It contains ground-breaking reliability and performance features not found in other systems. A revolution in web hosting, the (gs) Grid brings tomorrow’s hosting technology here today.