OK, I'll bite
Bit more than that. Lets say as well as your google account you chrome and have an Android phone which you use for navigation and browsing. Then they know or can deduce:
Where you live
Who your friend are and who their friends are.
Age and date of birth
What products you like to buy
What product groups are popular among your circle of friends so you might be into as well.
Where you work
Your hobbies and interests
Where you like to go at the weekend
Your phone and phone company
Who you bank with and who you have credit cards, mortgages or savings with. (They can't read your sessions but they can pull your history and see that you went to www.BankofAmericaonline.com and then went into a secure session.
When you are likely to be out (calendar)*
What make of wi-fi router you use
Who your ISP is
When you are out, even if GPS is off they can get your cell ID*
Who you call and are called by
The content of all your texts
Who you talk to on google Talk
What you say and what is said to you on google talk
Your YouTube account
Got you CV in your google docs? The add:
Where you went to school
What qualifications you got
Every company you have worked for.
Social security number
* Not much use to an ad broker but imagine if that leaked...
I doubt very much that is a comprehensive list of all they could learn about you. It would creep me out if any person set out to learn all that about me, I don't see any reason to be less creeped out by it being a company.
Think I'm mad? If you have an Android phone go into settings -> Manage Applications and pull up Google Talk Service or Google Search, scroll down to Permissions and see what those inocuous little apps have permission to do.