One computer to rule them all, indeed
I have been reading about IBM's Kittyhawk Project, which proposes a "global-scale shared computer capable of hosting the entire Internet as an application". This concept reminds me of the Planetary AC described in Isaac Asimov's short story "The Last Question", which is a worthwhile read.
At the very least, you can't accuse IBM of thinking small...
IBM jStart Emerging Technologies Development
(pictured is IBM Blue Gene, as Kittyhawk is currently theoretical)