There's also some great lectures and discussions on http://fora.tv although they have recently put some of them behind a premium model and butchered the site.
There's a case for the value of editorial oversight. This collection is one person's attempt to draw attention to particularly noteworthy talks among the TED oeuvre.
But to my mind that's already been done by having them posted here to HN individually. In that case there's the additional value of the discussion to go with them. Here there was no real editorial content except for just giving us a list, and just giving us a list is, well, giving us a list.
That's generally discouraged here anyway.
Just my $0.02. I'm interested to see people disagree, and always interested in hearing why.
The discussion usually happens in the comments, both here and on the site, like how is happening right now.
I think the real value is indeed in the discussion that is being generated after you've consumed an online resource, and I think this is the reason why we have comments here.
I thought that these videos could be helpful in some way for some fellow hackers and that's one reason why I posted the article here.
Another reason is that I'm genuinely interested in knowing about other related videos by reading the always interesting discussions here. I'm also trying to add all these contributions to the post as well.
You may be right about the fact that all these videos have been posted here before. I honestly don't remember about all of them but again I hope they can be useful to someone.