I just found out that RepBase, a service of Genetic Information Research Institute, which I have been using for the past few months, is based in Mountain View.
A mile from my house off of Rengstorff, actually right next to Google.
RepBase is some bizarre database of repetitive elements, seemingly curated for free.
Update: Agilent moved out of their office in Palo Alto, so Facebook moved in. I live within 5 miles of Google, Yahoo, Facebook, Pacific Biosciences, Affymetrix, and Roche.
Oh, and NASA's just down the street.