One Quickie

Runing a widget without installing it (Dashboard->General)
When you double-click a widget or open it 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 devmode YES
You can drag widgets out of the dashboard area and have them on-screen. Cmd-R will reload the widget.

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Advanced Mac OS X Programming book