Windows Presentation Foundation
I have to confess — despite it’s occasional complexity, WPF is my favorite GUI composition toolkit. To compose basic Windows (or forms, or dialogs — whichever you prefer to call them) my go-to tool is to simply fire up Visual Studio 2010 and type up the XAML. It feels natural and intuitive enough to express, pretty quickly, exactly how I want it to appear and how I’d like it to resize and reshape itself. That’s saying a lot, as when my mind is in design-mode I feel scant patience for scuffling along through the painful delays and barriers of less-inspired design tools.
James W. Hurst