Here’s a screenshot of Google’s UK homepage, as seen from most home computers:
And here’s Google’s UK homepage as seen from within our university network:
Notice any difference? (read on if you can’t spot it)
It’s subtle, but on-campus users will see a link to Google Scholar along with the links to Google Groups, News, Froogle and so on. I’m guessing Google thought that this service would be of less interest to most Google users, but those in academia will find it more useful. I’m also guessing it’s based on the IP range used by the client.
(Two minor caveats here: most users won’t see the ‘Desktop’ link either – that’s because I have Google Desktop Search installed, and technically I was outside the university when posting this but was proxying through a university server to get the second screenshot).