If you want to understand Google's strategy, then you've got to read this.
As mentioned, the presentation talks about, and
1. Why won't Google be affected by the [global economic] crisis?
2. Why is Google trying to change the mobile world?
3. Why isn't Youtube a content portal?
4. Why Microsoft fears Google?
5. How is Google competing with Facebook?
There are 9 more questions, and they're equally interesting.