Found funny list at Reddit that tells it pretty much how innovative Google is.
Google Analytics? Didn't make it, bought it from Urchin.
Google Docs? Didn't make it, bought it from Writely.
Google Earth? Didn't make it, bought it from Keyhole.
Google AdSense? Didn't make it, bought it from Applied Semantics.
Google AdWords? Didn't make it, copied it from Goto.com.
Google Chrome? Didn't make it, just slapped a UI on Apple WebKit.
FeedBurner? Didn't make it, didn't even rename the company.
Google Maps? Didn't make it, bought it from Where 2 Technologies.