It is now well known that when you drag and drop a file to the Printer Setup Icon installed in the Dock, it is printed immediatly ... but to the default printer without opening the application.
If you first open the Printer List window of the Printer Setup Utility, and then drop the file onto one of the printers in the list, the file will print on the chosen printer (local or not, inkjet or laser, etc.). Not that this doesn't work with PageSender Fax).
[robg adds: Although this method works, if you do a lot of drag-and-drop printing to different printers, you'll probably just want to use the Printers -> Create Desktop Printer menu item to make a desktop printer for each printer you normally use. After that, you can store these desktop printers in either the sidebar, the dock, or the toolbar for very quick access via drag-and-drop.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050417032116472