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We’ve known for some time that Google would be transitioning users away from its Picasa photo-sharing service to Google+ Photos, but now that process is nearly complete. Google has begun to redirect users from the old Picasa URL (picasweb.google.com) to Google+ Photos, which currently still offers a way to return to the old Picasa Web Albums interface during this transitional period.
The Google Operating System blog (an unofficial Google watching blog) noticed this redirect today, as well, noting that you can use the URL https://picasaweb.google.com/lh/myphotos?noredirect=1 to go directly to Picasa Web Albums without experiencing the redirect first and having to click back.
As not everyone will be ready to make the move just yet, the service will remember your preferences before the final switch is completed. So for example, if you head to Picasa Web Albums and are redirected, but choose to click the link back to Picasa, Google will set a session cookie to remember your choice and take you directly to Picasa the next time.