Walled Garden?

Temporally Relevant

Revelation that Google Base is Google Only ...

"...when any web tool other than a browser (such as another search engine) tries to access the content hosted on Google Base, they encounter this bit of protocol will disallow all use of the content to anyone other than Google:

http://base.google.com/robots.txt:

User-agent: *

...

Disallow: /base

---
Thanks to Doc for the lead