A cool trick posted on Murphy Mac describes how to configure Automator to have your Mac watch for e-mails containing certain criteria such as a specific subject or sender and configure actions such as going to sleep.

This is accomplished by creating a simple Automator program with two actions in its workflow, a one-line AppleScript file and a rule in the Mail program. A small sleeper action for Automator will need to be downloaded and installed from Apple's web site for the action to occur.

Configuring the action to occur takes just a few minutes with step by step instructions displayed here.

If you've seen any other cool tricks, let us know.