Hey guys!
I just discovered that the site I use to upload my pics usually to share them (mostly here) has just released an awesome mini-app that allows you to take screenshots on the fly of whatever area that it's being displayed in your monitor by selecting the area you want to shot (it even indicates the size of the selected square!) plus to add comments, arrows, rectangles, etc. and then, to upload it to the site, save it, print it..... It's awesome, seriously! 
