Comparison Shopping -- Now There's a Market

I really like the e-commerce market -- I think it's the easiest business model to understand. I heard about uSwitch getting acquired and was inspired to see how much this space has created in terms of exit value. Here is a quick summary of what I could pull together in 5-10 minutes of work:

Shopping.com - $620 million Shopzilla - $525 million Pricegrabber - $485 million uSwitch - $366 million

Now that's what I call a market -- four companies getting acquired for almost $2 billion. This doesn't even include the old mySimon acquisition or the value created by tools owned by existing major web properties (Google, Yahoo!, etc).