A discussion about scrot was started in the previous entry.  I thought it deserved its own block.   To see what is possible command-wise, put scrot --help in your terminal.  I put scrot commands right on my root menu (schema.pl from obmenu-generator), so I can take shots as quickly as I can click the menu entry.  I program them to go directly to an image editor, but they could just as easily be saved in some file.  For my menu command set-up, see http://lxlinux.com/obmenu-generator.html.