Una delle cose che piu' mi esalta in Visual Studio 2005 e' il class designer per la modellazione delle classi (nonche' utilissimo per analizzare quelle presenti nel framework)
Se le attuali features non fossero sufficienti, potete installare i nuovi powertoys che aggiungono questi nuovi comandi:

• 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