Corporate companies like these selling sites and buying sites is funny. They pay with shares. If you don't know what shares are, just think of a few bytes on a hard drive somewhere, thats valued at a couple of billion dollars. If somebody paid me $1 I bet the tax man would be the next person to knock on my door. Companies such as Micro$oft and Yahoo have no real physical value, as their value is based on the stock market. Just watch out for some mad man blowing up something that matters to the financial market. Bye bye to their market value.
Ok, did a bit of quick research and found more, I tried to narrow it down to only web-related companies, and a lot of these websites obviously include the whole business behind them, and tried to exclude non-web ones (like Nokia's $8bil acquisition of Navteq), and rounded it off to this (apologies if I missed any) : Microsoft buys aQuantive Inc : $6bil in cash Yahoo buys Broadcast.com : $5.7bil AOL buys Netscape : $4.2bil Yahoo buys GeoCities : $3.6bil Cisco buys WebEx : $3.2bil Google buys DoubleClick : $3.1bil Google buys Youtube : $1.65bil in stock Yahoo buys Overture : $1.63bil Microsoft buys Fast Search and Transfer : $1.2bil - Unsure Yahoo buys 46% of Alibaba : $1bil Google buys 5% of AOL : $1bil Special mention: Google buys dMarc Broadcasting (radio advertising) for $102mil upfront, with a possibility of $1.136bil over three years if certain targets are met Ref #1 Ref #2 Ref #3 MSFT/Fastsearch