David Weinberger has a lucid post dismantling the argument that Web 2.0 and "citizen journalism" will lead to mediocrity. Here's a snippet:

Donnacha acts as if the Web were as weak as its weakest link because we can't tell the difference between weak and strong links. In fact, the Web at its best is stronger than its strongest links, because those links get tempered through the exposure to multiple points of view.