You can download the source code and the installer from the gotdotnet workspace.
Here is a list of features:
Design Tools Enhancements
- Diagram Search
- Formatting Commands
- Floating Property Grid
- Pan/Zoom Window (a personal favorite)
- Design Surface Scrolling Improvements
- Create Comments with Double-Click
- Design Surface Grid
Class Designer Enhancements
- Export Diagrams for Web (a personal favorite)
- 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