Link to October 14 eweek.com post, "Why Facebook, Twitter, Google Wave Still Bow to King E-Mail".
Excerpt: E-mail may be boring, but, sorry, it remains the king of communications. Despite Nicholas Carr's assertion that asynchornous communication is now our enemy, we can't always be connected, nor do we want to always engage with real-time services.
As anyone who has suffered the headache-inducing, co-editing cursors of Google Wave can attest, always-on connectivity hurts productivity worse than e-mail. Sometimes we need to unplug, regardless of whether we are working or playing.
The notion that e-mail is some bygone, passé application is wishful talk perpetuated by Silicon Valley folk breathing in every bit of Web 2.0 asbestos imaginable. Try this new widget! Have you checked out this recommendation engine? You mean you're still using Snurl?! You have to try Bit.ly.
Facebook and Twitter are great social networks that spark fun, often frivolous and speedy communications. But these platforms are hardly supplanting Outlook, Lotus Notes or even Gmail in businesses.