Take a screenshot on a Windows 8 slate

I was working on a post the other day and needed a screenshot. I didn't have a keyboard with me and that makes a screenshot very hard to take... I remembered the Windows Phone shortcut key (Win+Pwr), but that didn't work at all on the slate, either bringing up the start screen or turning off the slate...

Some experimentation later, I've found that Win+VolDown does the trick. It will save a screenshot directly to your profiles Pictures library under a Screenshot folder.