I change the number of results-per-page setting quite a lot, and I just noticed that the "Preferences" link on the Google homepage that I normally use to change my results-per-page setting is missing. Instead, it is now located in a "Settings" drop-down menu up at the top, named "Search Settings".
Before, the "Preferences" link was to the right of the search box, I believe under "Language Tools". In the words of Stewie Griffin... "I don't like change".
Take a peek:
Edit: The "Settings" link at the top will be a drop-down to include both "Search Settings" and "Account Settings", if one if logged into an account. If one is not logged into an account, the "Settings" link will change to read "Search Settings", and it will go directly to the settings/preferences page.