Excellent interactive map of the development of web usage in Australia from 2001 till 2008, here.
Click the 'play' button for an automated view of the rise and fall of different sites. Scroll over the circles to identify the sites' names. And for more enlightenment, change the view perspectives -- on the right hand side, or the x-axis as they put it, from say time spent to page views. The y-axis option (at the bottom) also offers some alternatives.
Most notable: the growth and decline of e-bay and myspace and the growth of google and facebook.