I love the sketchy look of Balsamiq and the ability to put designs together quickly. I would love to be able to do the same thing for architecture diagrams but Balsamiq doesn't have any objects for those kinds of drawings.
Visio and PowerPoint work OK, but the interface gets in the way. (searching for objects, etc.) The end result is also too polished and formal looking, which is bad at the conceptual stage of a new system.
Is there another tool that works like Balsamiq that would work for architecture diagrams? Whiteboard + camera is good, but I don't always have a whiteboard.