http://froogle.google.com/ $1,282,188
http://maps.google.com/ $403,900,000
http://earth.google.com/ $15,125,000
http://finance.google.com/finance $8,360,000
http://www.youtube.com/ $969,900,000
http://www.google.com/ $1,959,900,000
Total Net Worth of Google:
$3,358,467,188
Those are the big ones. Here's an entire list of their acquisitions, which I do not want to start to dig into. There's also been talk of them buying Wikipedia.