The snipping tool has to be one of the best features introduced into Windows Vista (except for the nasty red line around the pictures). PRT-SCRN is now a thing of the past. But what do you do when your Mac doesnt even have a PRT SCRN key? Press any key ? ? ? ?

CMD+SHIFT+4 is the combination to remember .. and then press the space bar if you want a screen shot of the current window