Here are a few enormously successful (and highly complex) products that you missed:
1-2) AdWords and AdSense revolutionized web advertising. Those two products generated $6.5 billion in revenue just in Q1 of 2010.
3) Android. Others have commented that this was an acquisition, but that happened in 2005, and it was a relatively small team. I'd wager that most of the current Android code was written after the acquisition, and by engineers who weren't from the original Android team.
4) Chrome.
Regarding the number of engineers, Google had 20,000 employees as of March 2010. You can make your own guess about how many of them are software engineers, but it's a lot less than 100%.
1-2) AdWords and AdSense revolutionized web advertising. Those two products generated $6.5 billion in revenue just in Q1 of 2010.
3) Android. Others have commented that this was an acquisition, but that happened in 2005, and it was a relatively small team. I'd wager that most of the current Android code was written after the acquisition, and by engineers who weren't from the original Android team.
4) Chrome.
Regarding the number of engineers, Google had 20,000 employees as of March 2010. You can make your own guess about how many of them are software engineers, but it's a lot less than 100%.