When you double-click a widget or
openit from the terminal, you get asked if you want to install it (which will move your widget to
~/Library/Widgets, which is really annoying when it drags it out of your development area. When faced with the dialog, hold down command and option to get a "Run" button. That'll run the widget in-pace. If you tun on the devmode:% defaults write com.apple.dashboard devmode YESYou can drag widgets out of the dashboard area and have them on-screen. Cmd-R will reload the widget.