Tell me
Yes:
- Google does not own your data.
- Google does not share your data. There are a few exceptions in the Privacy Policy (court order, imminent threat to life).
- Google keeps the data as long as you want.
- Google deletes the data when you ask.
- Google allows you to take the data out of its system.
For further reference, see http://www.google.com/edu/trust/
For a clearly-worded explanation of Google's privacy and security policies, see http://www.google.com/support/a/bin/answer.py?answer=60762