Skitch is a Mac only application which allows you to grab a picture of anything you can see on your screen. You can annotate the picture and then email it or post a URL link. I use it for clarifying design details with customers when working on their websites.

There are several other similar applications available, but Skitch is my favourite. Have a look at the introduction video.

I forgot to mention the cost - free, zilch, zero, nothing!

Tags: Skitch, Software