i found a website that you can screen recording (web-based recorder) with no any download first. but, JAVA required.
This website no only for screen recording, but this website can spread your recorded video to YouTube, twitter, embed to your site, or download to your PC/MAC!
After Recording, video Quality automatically convert to High Definition(HD)
Can use for MAC an PC. No register required, but you must have twitter account for use that feature.
Now, my plan is use this website to make video tutorial/screencast on concrete5 Indonesia.
