Check the Doneness of Meat

Here's a guide from Simply Recipes on how to test the done-ness of your meat (I assume steak is the key meat here) by using the firmness of your hand as a reference.

http://www.elise.com/recipes/archives/007259the_finger_test_to_check_the_doneness_of_meat.php

I haven't tried it myself but it certainly doesn't seem very applicable to a wide range of meats.