I'm checking out the new Google Trends feature where you can compare sites. I heard this was supposed to launch Tuesday so they jumped the gun. There's great coverage in Search Engine Land and Mashable.
With the new feature, you can supposedly compare unique visitor estimates over time for various sites, making Google trends compete with Quantcast and Compete. Despite various screenshots posted, I can't see the unique traffic numbers for any site I try.
A bigger surprise is that you can't see any traffic estimates - even estimates! - for Google.com.
Click the image to enlarge further.