Joi Ito has been meeting some interesting people lately, like Larry Page of Google.
Google has 3 billion pages indexed. Wisenut is making noises about some big announcement coming soon. But they are still at one to one and a half billion pages. The amount of processing involved in analyzing and categorizing that much data is mind boggling.
All of these companies have probably created their own database systems from scratch just so that they are optimized for the requirements of a search engine.
This field has been full of announcements lately and I bet that a big player is behind the acquisitions and will soon acquire the acquirer. Yahoo has something up their sleeve and Bill Gates most certainly has to have something planned. Stay Tuned.