If you need to screen cast then check out Screen Toaster, it's fast easy to use

• Register & use it anywhere, anytime
• No download. Compatible with Windows, Mac OS X, Linux.
• Capture videos of onscreen action in one click
• Record screencasts, tutorials, demos, training, lectures and more.
• Share and stream videos online in Flash
• Embed them on blogs and webpages or send them by email.