I'm no expert on this, but isn't the conventional wisdom that this time around the economic factors are much more solid. There is a much more revenue being generated, simply because by now people are making a lot of $$ of purchases on the internet.
Just because people are selling companies and there's a lot of money floating around doesn't mean it's neccessarily a bubble...maybe it's just good business.
It's the hype that makes everything seem bubbly. It's quite annoying for a lot of people which is why http://www.uncov.com/ and many other rants about it exist: to take the hype down a peg or two.
No. Uncov exists because the easiest way to get eyeballs without any real insight is to ride someone else's wave. Ranting is easy.