I know that one thing that some people like about my Mobile Technology in TAFE wiki is the pictures that explain “how to do” a particular step when using a software application. People from other countries have even asked if they can use them.
If you want to make your own pictures, quick and easily, then I suggest you give the program I use a try. SnagIt allows me to take Screen captures, edit the pictures, add notes, call outs and so much more. I strongly recommend you to download their 30 day trial and give it a go. Brilliant program and definitely worth it. I was using Photoshop but SnagIT is a really quick and easy way to do fast creations of pictures.