Screenr is a simple and fantastic way to develop sreencasts. It´s a web based tool that helps you create a screencast with a simple click . You can add your narration using the computer microphone. Also, you can share your screencasts on Twitter, YouTube or other site on the web. You need to sign in with your Twitter account.
Venture Slogan: Instant screencasts for Twitter
Screenr’s own description: “…Screenr is a web-based tool that lets you create screencasts without installing any software. You just click the record button and your screen activity is recorded along with narration from your microphone…”