That was you? My apologies. I think you do need to have a Dev account to get Quartz Composer, however I don't think you need to have a paid Dev account. Although I'm sure you can download it elsewhere on the web, I'm just not sure where. I downloaded mine forever ago. I don't even think Xcode was in the MAS back then.
You really should have said that in the video.
Oh, and i found the app, your right dev account is free. Can't wait to make my screensaver, just got to nab a scene of youtube.
Go ahead and post your latest YouTube videos here's a few of mine.
Since the forum doesn't support youtube videos post urls.
thunderCAT
http://www.youtube.com/watch?v=PrOVlx7fFP8
Changing Cars Part 3
http://www.youtube.com/watch?v=I9EapPFIpRo
Yours sucks.