Huh, I didn't know that. But why geoIP-based redirects on some sites and not others? google.com redirects me to google.dk, and even blogspot.com redirects me to blogspot.dk, but maps.google.com doesn't take me to maps.google.dk.

I believe the logic was that "google.com" always does the redirect, because people tend to type google.com manually into their address bar a lot. Google has never bothered to set up any other redirects itself.

Other services that Google has acquired, though (e.g. Blogger, Youtube, etc.) may have come pre-set-up with redirection logic, and Google has mostly left that untouched.

Blogspot changed their behavior long after Google bought them.