Businesses move slower but it's inevitable that aspects of wikis & blogs will become a part of the enterprise.  For example, see http://theworkplaceblog.com.  Some are saying that the landscape is forever going to change (i.e. like it's never been before); some say that it will be somewhat of a hybrid (aspects will never change); and I think deep down inside some are thinking it's like a pendulum swing, with more new toys in the future, but the scene's not really going to be that much different after all is said and done.  I guess what it really comes down to is the values of the enterprise as opposed to the technologies available.  In many ways, technology is just an amplifier of what has always been.