Quite often teachers need to include screenshots of WebPages or bits of software - usually when creating "How to" guides for students so that they know how to get a certain task done.
My personal favourite is JING as it allows you to quickly and easily do both:
You can download a PDF manual for Jing by clicking here.
The above video illustrates what Jing can do - it should be your first port of call for screenshots & screencasts.
Education > Free & open source resources for educators & trainers > Multimedia Tools & Resources >