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Apparently Google's hardware has scaled to 100,000 machines claims this article, which also speculates a little on how it might be used. I'm sure Google's potential acquisition targets think long and hard about how having that much processing power (or even a small fraction of that) might improve their web service.

Philip Greenspun is theorising that Google is planning to bring a web-office application (a MS Office competitor) to the masses.

Personally, I think that they are growing their Search and Adsense-serving capabilities. When will Adsense become the de-facto internet ad?

On the other hand, their price comparison search (Froogle) appears poor, their search itself now being caught by other search engines (Yahoo!) and users may ask themselves why switch mail if Yahoo/Hotmail offer similar capacities? Has their growth become that of a mature company?