Google will present something--we don't yet know what--in a special 15-minute slot at the TechCrunch50 event Monday at 11:45 a.m. Pacific time. I will be there and will cover the announcement in a live blog. For the as-it-happens report, check in on Webware at 11:40 a.m. or so, or sign up in the widget below to get a reminder e-mail.
If you have a theory about the announcement, take the poll at right. You can enter your own option if you don't like the ones I've included.
Update: Google has just announced the Google News Archive, which includes digitized newspapers from way back. Story coming soon on News.com.