Safari extension for Google results navigation (↑/k, ↓/j)
I am also very annoyed by this. I found an old extension that isn't supported anymore called Mafuyu (http://wakabamac.blog95.fc2.com/blog-entry-1013.html). I've tried to run it but it's obsolete. 

Another option seemed to be knogs which I found on GitHub (https://github.com/nqzero/knogs), originally for Chrome and Firefox but apparently someone adapted it for Safari. However, I have been unable to find the version for Safari because the only link i found was broken. (https://dl.dropbox.com/u/90126/GoogleJK/GoogleJK.safariextz)

If someone found the solution to this it would be greatly appreciated.

Thanks in advance.