The Internet killed the value of information. Information became so pervasive that traditionally information-based businesses needed to reinvent themselves to survive because a few button clicks in Google (or even AltaVista) could open up a library of information more impressive than most... well... libraries. Professional service providers became undermined by automated tools and strove for added value.
With Web2.0 allowing almost anyone to become a publisher, you might have expected this trend to continue. Has it? Will it? Actually, I'm going to be rash and make a prediction. Safe in the knowledge that I can delete this post down the line, I'm going to put my head on the block of futurology. I believe information has become such a commodity that people are finally starting to recognise the value of good quality sources. Others might say that we've all experienced misinformation online and that such scraping of the barrel was bound to induce a hockey stick kicker. Differentiation has real meaning. Wikis compiled by professional service providers are garnering a respect not seen since the late eighties. Beware the expert- they're back, and they really are experts!
The true acid test though, is "are people prepared to pay for it?" Look out for those green shoots. Expect a resurgance in subscription newsletters, but watch for the subtle transfer to the blog format. Round the corner is a new wave of knowledge commerce.