Running a 'consumer grade' OS like Linux Mint makes it pretty easy. On pretty much every piece of hardware I own, a dozen or more platforms, the PrtScn key just works. Press the key, a dialog window pops up. Tell it a name for your screen grab and where to put it. Presto, graphic created. Then you can open gimp and photo edit to your heart's content. Crop it down, etc. Then post it to Imgur, which was a great suggestion on Josh's part. I just started using Imgur and like it a lot.
Honestly, you guys with your arch and slackware sometimes remind me of that scene in the movie Animal House- the 'other' fraternity's initiation rites. Whack! Thank you sir, may I have another? Whack! (etc.)
No, seriously, I do admire folks who compile their own OS. I've been too lazy to learn.