You tube

I liked the layout of "Video coolness at my library".
And although I really like the idea of having the book cover as link, I was disappointed to see the amazon website.
I expected to see a reliable book review.
The embedded clip above caught my attention with the title.
5 ways to save the world...
It is a simpler and rough version of Al Gore's inconvenient truth, but I though it
it had much higher chance of being viewed by the audience, because of its accessibility.
I did not find google video particularly more interesting. Both youtube and goodle video were similar... and unless there is improvement, or a distinctive feature, it is unlikely for the users to prefer one over the other?

Wiki

I haven't been able to work on Learning 2.0
It is time to catch up!
I have to admit, I did not appreciate the idea of wiki. Yes it can be useful and it can be more efficient way to communicate. But I still doubt the reliability. It is just a good quick reference for general curiosity...
I guess it really depends on the contributor and your personal interests.
I am not a regular 'wiki' user but Mint Wiki was really impressive.