Screencast/Videostreaming

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Get flash to fully experience Pearltrees
http://www.syniumsoftware.com/screenium/ When you've finished creating an instructional video for your parents or friends, customers or colleagues, export it in any video format supported by Quicktime. Make it available on a network server, your website, upload it to YouTube.com or any other video sharing portal. The more people can access your work, the merrier. Export the videos for Macs, iPhones or the AppleTV.

Synium - Screenium

Download Copernicus for Mac - Take advanced screenshots

http://www.macupdate.com/app/mac/7808/copernicus Take advanced screenshots. Free Copernicus has been redesigned from the ground up to bring you the easiest screen capture and movie capture available. It features the ability to capture movies directly to ram, offering higher framerates than possible with other programs. Once you are done recording your movie, you can export to any video format that QuickTime supports, including MPEG-4.
Enhance Your Online Conversations With Jing Jing gives you the basic tools to start sharing images and short videos of your computer screen. Capture What You See Capture an image of what you see on your computer screen with Jing. Simply select any window or region that you want to capture, mark up your screenshot with a text box, arrow, highlight or picture caption, and decide how you want to share it.

Jing, screenshot and screencast software from TechSmith

http://www.techsmith.com/jing.html
http://mashable.com/2008/02/21/screencasting-video-tutorials/ Ever wondered how people show you so clearly what is happening on their computer, like in the Photoshop Video Tutorials we shared with you? Thanks to screencasting software, anyone can do it. So what's stopping you now from making your own how-to videos?

12 Screencasting Tools For Creating Video Tutorials