Google has released a new product called Google Dashboard. This allows users to see what data has been collected on an account associated with a number of Google products. So, if you use GMail, YouTube, and Reader on the same account, you'll see the data collected for each service.
You can check the data collected for your Google account at Google.com/dashboard. You'll have to sign in, even if you're already signed into your Google account. Also, it can take several seconds to load all of the data - and while 20 products are available to view in Google Dashboard, not all of Google's services are included just yet.
To learn more, check out this video:
