Recently, I spotted Shutter as feature app on the Ubuntu Software Center. I been mildly interested in something a little fancier than the gnome capture tool or the screen capture feature built into gimp.
After only a bit of learning curve, I really started to like Shutter. The primary utility provide is being able to capture a screen shots back to back then triage them in a batch later. Much nicer when you’re trying to document steps in a process.
Also welcome is a decent simple image editor for highlighting and annotating the captures. It also has features to easily push captures out to a myriad of different sharing services. I haven’t much use for that, yet, anyway.
While not quite as pretty or slick as Skitch on Mac, it gets the job done all the same. Worth a look.