Skitch is a great free piece of screen capture software for mac, but it does a lot more than just straight screen shots. Skitch will also allow you to just drag images straight off the web and annotate them with arrows text and shapes if you need to. You can send the files straight to Evernote, attach to an email or drag out to other apps. I made a quick video to show you how it works (plus I got to experiment with Screenflow at the same time too 🙂 )

Skitch is owned by the same people that make Evernote and is also available for iphone/ipad and android – find out more at www.skitch.com/