Visual Studio 2005 Team Edition - The Integrated Development Environment (IDE) technology workers use to accomplish work. There are five "editions", each targeted to a particular role:
- Visual Studio 2005 Team Edition for Software Developers
- Visual Studio 2005 Team Edition for Software Testers
- Visual Studio 2005 Team Edition for Database Professionals
- Visual Studio 2005 Team Edition for Software Architects
- Visual Studio 2005 Team Suite - This edition encompasses the functionality of the other four. It's an extra $1200 but I recommend it. The crossover value is well worth the money.
Visual Studio 2005 Team Test Load Agent - This add-on module leveraged by Visual Studio simulates virtual users against a web site. It is used in conjunction with the Web Test functionality within Visual Studio 2005 Team Edition for Software Testers.
Visual Studio Team System - This moniker refers to the entire line of products...including all of the above: Visual Studio Team Edition, TFS, and the Load Agent. It is not a product per se but a line. I.e. one cannot purchase Team System, one purchases the individual components of Team System.
Wikipedia Team System Entry