Everybody likes to express their opinion, but it so often appears that no one cares, and that our opinions don't really matter. Several Web 2.0 applications actually build their readers' opinions into the site as a way to add value to their information. Here's an example from Wired.com where users can change the ranking of corporate privacy villains, moving them to places of prominence on top of the page or to oblivion off the bottom. Scroll down the page to see the up and down arrow buttons and the number of ratings readers have shared by clicking on them.
* Ranking example from Wired.com
Wikipedia article on Wisdom of Crowds
http://en.wikipedia.org/wiki/Wisdom_of_crowds
Crowdsourcing Examples:
Wikipedia corrections of Britannica
http://en.wikipedia.org/wiki/Wikipedia:Errors_in_the_Encyclop%C3%A6dia_Britannica_that_have_been_corrected_in_Wikipedia
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