Mac OS X: If you've ever had trouble remembering all the different screen capture commands or were wondering how to access preferences, Captur can help you out. It sticks every screen capture option Mac OS X provides in your menubar and offers up some finer controls but letting you adjust the preferences — something you can't easily do through Mac OS X on its own.
The upside of Captur is not so much the GUI interface it provides for grabbing screenshots, but the options it provides. Not only can you set the file type and name of your screenshots, but you can also adjust the formatting and immediately view the screenshot in QuickLook after you've taken it. These options are fairly minor, but make the screen-grabbing experience a lot more pleasant. The date options also allow you to save screenshots that will sort properly when viewing in alphabetic order, unlike the screenshots produced by the Mac OS X defaults.
While we're big fans of previously mentioned screenshot utility Skitch, if you're looking for something that's pretty minimal and seeks to simply improve the built-in option you already like, Captur is a great little utility.