This is the latest version, built on 2006/11. The installer and source code are available for download from CodePlex workspace. The installation requires the release version of Visual Studio 2005 installed on the machine. You can use the Class Designer MSDN forum or discussion boards in the workspace to post any questions/feedback on the add-ins.

Here is a list of features provided by the add-ins (you can find more detailed description in the documentation installed by the download):

Design Tools Enhancements
- Diagram Search
- Formatting Commands
- Floating Property Grid
- Pan/Zoom Window
- Design Surface Scrolling Improvements
- Create Comments with Double-Click
- Design Surface Grid

Class Designer Enhancements
- Export Diagrams for Web
- Display Xml Comment Command
- Documentation Tool Window
- Filtering Appearance
- Filtering Lines
- Filtering Members
- MSDN Help on System Types
- Fast Navigation
- Interface Lollipop Labels Commands
- Inheritance Visualization Commands
- Show Type Command
- Association and Inheritance Line Dongles
- Create Tests Command
- Type Creation Commands
- Add Member Commands
- Synchronization with Code Definition Window
- View Class Diagram Command Improvements
- Creating Custom Add-ins

Enjoy!