Article in the New York Times - Mashups Going Mainstream ?

So, this New York Times article claims that mashups are about to go mainstream - do you agree ?
Have you been playing with mashups?
Have you build a "real" or at least really usefull mashup application?

Previous posts of mine on mashups:
http://weblogs.asp.net/jackieg/archive/2007/05/30/mashups-for-the-masses.aspx
http://weblogs.asp.net/jackieg/archive/2007/04/02/back-from-speaking-at-vslive-san-francisco.aspx