Screencasting doesn't have to be a complicated affair. If all you need is a quick screencast to show a friend how to do something or commemorate your awesome Line Rider skills, Screenjelly can deliver.
To use ScreenJelly all you need is a Java-enabled web browser. Visit the website, select your audio device (if you desire audio with your screencast) and hit the big red button. You get a brief warning count down and then you're on your way.
You can share your video directly via email or on various social networks such as Twitter, Facebook, MySpace, Delicious, Digg, and Friend Feed. You can record up to three minutes of video with audio, there is no option to edit in anyway save for starting from scratch.
One minor caveat: if you have multiple monitors you will only be able to record on the primary monitor—although you can place a browser with Screenjelly loaded on the secondary monitor which makes it easy to smoothly start and stop your recording. If you have a favourite tool for simple screencasting, let's hear about it in the comments below.