Screenr is a free, simple, and instant screencasting software. On the main page is a record button. Click that and you can begin recording video and audio of your screen. To save your screencasts you will need to login using Twitter, Facebook, Google, or Yahoo! You can resize the frame around what you want to record. You have up to five minutes for your recording.
For educators, Screenr provides an opportunity to share with students a video for searching through a teacher webpage or using a software. For teachers and principals, it could be used to show teachers how to proctor an online assessment or access important documents.
Just so you know, you will need to have an updated version of Java.