The easier something is, the more often it will be used. Look at SMS text messaging. It's a stupidly expensive way to send information when you look at dollars per byte, but it's stupid simple easy! You don't even have to wait for your laptop to come out of standby. You don't even have to wait for the phone ring.
Jing makes showing someone what's going on your side of the screen almost SMS simple. Once you sign up and install the app (ok, there's some overhead but you only have to do it once,) click capture, select a portion of the screen or a window, then select snapshot or video capture. Once you're done you can save the capture a number of ways but the really easy way is to have the capture saved on a hosted site. Jing puts the url into your clipboard so you can just paste the link into an email or instant message. Now that's easy.