The short podcast narrated by my instructor mainly addressed the positives of Web 2.0 and defines it as a pleasant upgrade from the prehistoric Web 1.0 that we've grown so fond of.
The most interesting quote I found from this website is:
"Think of it like a house," said Hoffman, who will give a presentation on AJAX security at next week's Black Hat security event in Las Vegas. "A traditional Web site is like a house with no windows and just a front door. An AJAX Web site is like a house with a ton of windows and a sliding door. You can put the biggest locks on your front and back doors, but I can still get in through a window."
In essence, Web 2.0 gives users access to an abundance of cool features, but doesn't ...
This excerpt explains the differences between Web 1.0 and 2.0, in addition to the dangers and benefits they provide for users.