MySpace breaks the top 10 websites according to Nielsen/NetRatings for March 2006:

Top sites in March 2006
Site	Audience, 000	Time spent
Yahoo!	105,027	3:28:39
Microsoft	99,368	0:50:16
MSN	95,124	1:52:10
Google	93,244	1:00:56
AOL	75,348	6:13:54
eBay	55,573	1:59:18
MapQuest	40,809	0:12:05
Amazon	40,721	0:23:21
Real	36,961	0:43:00
MySpace	36,373	2:09:04
Source: Nielsen//NetRatings

I’m surprised MapQuest is still in this ranking. Yahoo and Google make much better mapping products. I guess it shows the importance of building a brand and being the first on the market.