Google is testing a new feature that mimics something Yahoo already partially has:
Google Links, i.e. links to your favourite Google services, that will follow you everywhere you go on Google.com.
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While looking at these services, you will see something weird: what is Google CL2? The famous Google Calendar,
announced since more than a year? If you click on the link, you get "The page you requested is invalid".
Update:
Google Calendar screenshots