Skitch for Windows to be exact. This is a Mac first program so I expected a few problems. Unfortunately it never worked past opening the program itself.
Skitch is supposed to be a quick annotation software from Evernote. I am always on the lookout for photo editing software that does one specific thing well to save time. I have no time to launch Gimp just to add an arrow, which Gimp does not do with out a special arrow plug-in.
This program seemed ideal but just would not work on my Windows setup no matter what I tried. While I cannot fully blame there website does not have a systems requirement page, at least I cannot find one.
My system does not have a graphics card but I still am able to do plenty, I assume that Skitch requires a graphics card. Oh well I still have Fireshot.